Photographing optical lens system, image capturing unit and electronic device

ABSTRACT

A photographing optical lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element. The second lens element has positive refractive power. The eighth lens element has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the eighth lens element has at least one convex shape in an off-axis region thereof, and both an object-side surface and the image-side surface thereof are aspheric. The photographing optical lens system has a total of eight lens elements. An air gap in a paraxial region is located between every two lens elements of the photographing optical lens system that are adjacent to each other.

RELATED APPLICATIONS

This application is a continuation patent application of U.S.application Ser. No. 14/866,314, filed Sep. 25, 2015, which claimspriority to Taiwan Application 104126122, filed Aug. 11, 2015, all ofwhich are incorporated by reference herein in its entirety.

BACKGROUND

Technical Field

The present disclosure relates to a photographing optical lens system,an image capturing unit and an electronic device, more particularly to aphotographing optical lens system and an image capturing unit applicableto an electronic device.

Description of Related Art

In recent years, with the popularity of electronic devices having camerafunctionalities, the demand of miniaturized optical systems has beenincreasing. The sensor of a conventional optical system is typically aCCD (Charge-Coupled Device) or a CMOS (ComplementaryMetal-Oxide-Semiconductor) sensor. As the advanced semiconductormanufacturing technologies have allowed the pixel size of sensors to bereduced, and compact optical systems have gradually evolved toward thefield of higher megapixels, there is an increasing demand for compactoptical systems featuring better image quality.

A conventional optical system employed in a portable electronic productmainly adopts a lens structure with fewer lens elements. Due to thepopularity of mobile terminals with high-end specifications, such assmart phones, wearable devices and tablet personal computers, therequirements for high resolution and image quality of present compactoptical systems increase significantly. However, the conventionaloptical systems cannot satisfy these requirements of the compact opticalsystems. Since an image capturing unit applied to the electronic producthas evolved toward the field of large aperture, wide field of view,large image surface and high resolution, the conventional optical systemis unfavorable for simultaneously satisfying the requirements of goodimage quality and compact size. Thus, it is important to develop anoptical system to provide good image quality and compact sizesimultaneously.

SUMMARY

According to one aspect of the present disclosure, a photographingoptical lens system includes, in order from an object side to an imageside, a first lens element, a second lens element, a third lens element,a fourth lens element, a fifth lens element, a sixth lens element, aseventh lens element and an eighth lens element. The second lens elementhas positive refractive power. The eighth lens element has an image-sidesurface being concave in a paraxial region thereof, wherein theimage-side surface of the eighth lens element has at least one convexshape in an off-axis region thereof, and both an object-side surface andthe image-side surface of the eighth lens element are aspheric. Thephotographing optical lens system has a total of eight lens elements.There is an air gap in a paraxial region between every two of the lenselements that are adjacent to each other. When an axial distance betweenan object-side surface of the first lens element and the image-sidesurface of the eighth lens element is Td, a focal length of thephotographing optical lens system is f, a vertical distance between anon-axial critical point on the image-side surface of the eighth lenselement and an optical axis is Yc82, the following conditions aresatisfied:Td/f<2.0; and0.10<Yc82/f<0.80.

According to another aspect of the present disclosure, an imagecapturing unit includes the aforementioned photographing optical lenssystem and an image sensor, wherein the image sensor is disposed on theimage side of the photographing optical lens system.

According to still another aspect of the present disclosure, anelectronic device includes the aforementioned image capturing unit.

According to still yet another aspect of present disclosure, aphotographing optical lens system includes, in order from an object sideto an image side, a first lens element, a second lens element, a thirdlens element, a fourth lens element, a fifth lens element, a sixth lenselement, a seventh lens element and an eighth lens element. The secondlens element has positive refractive power. The eighth lens element hasan object-side surface being convex in a paraxial region thereof and animage-side being concave in the paraxial region thereof, wherein theimage-side surface of the eighth lens element has at least one convexshape in an off-axis region thereof, and both the object-side surfaceand the image-side surface of the eighth lens element are aspheric. Thephotographing optical lens system has a total of eight lens elements.There is an air gap in a paraxial region between every two of the lenselements that are adjacent to each other. When an axial distance betweenan object-side surface of the first lens element and an image surface isTL, a maximum image height of the photographing optical lens system isImgH, the following condition is satisfied:TL/ImgH<2.0.

According to still yet another aspect of present disclosure, aphotographing optical lens system includes, in order from an object sideto an image side, a first lens element, a second lens element, a thirdlens element, a fourth lens element, a fifth lens element, a sixth lenselement, a seventh lens element and an eighth lens element. The secondlens element has positive refractive power. The eighth lens element hasan image-side surface being concave in a paraxial region thereof,wherein the image-side surface of the eighth lens element has at leastone convex shape in an off-axis region thereof, and both an object-sidesurface and the image-side surface of the eighth lens element areaspheric. The photographing optical lens system has a total of eightlens elements. There is an air gap in a paraxial region between everytwo of the lens elements that are adjacent to each other. When acurvature radius of the image-side surface of the eighth lens element isR16, a focal length of the photographing optical lens system is f, amaximum effective radius of an object-side surface of the first lenselement is Y11, a maximum effective radius of the image-side surface ofthe eighth lens element is Y82, the following conditions are satisfied:0.10<R16/f<1.0; andY11/Y82<1.25.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be more fully understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 6thembodiment;

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 7thembodiment;

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 8thembodiment;

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 9thembodiment;

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure;

FIG. 20 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 10thembodiment;

FIG. 21 is a schematic view of an image capturing unit according to the11th embodiment of the present disclosure;

FIG. 22 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 11thembodiment;

FIG. 23 is a schematic view of an image capturing unit according to the12th embodiment of the present disclosure;

FIG. 24 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 12thembodiment;

FIG. 25 is a schematic view of a maximum effective radius of anobject-side surface of a first lens element, a maximum effective radiusof an image-side surface of an eighth lens element and a verticaldistance between a non-axial critical point on the image-side surface ofthe eighth lens element and an optical axis in FIG. 1;

FIG. 26 shows an electronic device according to one embodiment;

FIG. 27 shows an electronic device according to another embodiment; and

FIG. 28 shows an electronic device according to still anotherembodiment.

DETAILED DESCRIPTION

A photographing optical lens system includes, in order from an objectside to an image side, a first lens element, a second lens element, athird lens element, a fourth lens element, a fifth lens element, a sixthlens element, a seventh lens element and an eighth lens element. Thephotographing optical lens system has a total of eight lens elements.

According to the photographing optical lens system of the presentdisclosure, there is an air gap in a paraxial region arranged betweenevery two of the first lens element, the second lens element, the thirdlens element, the fourth lens element, the fifth lens element, the sixthlens element, the seventh lens element and the eighth lens element thatare adjacent to each other, that is, each of the first through eighthlens elements of the photographing optical lens system is a single andnon-cemented lens element. Moreover, the manufacturing process of thecemented lenses is more complex than the non-cemented lenses. Inparticular, an image-side surface of one lens element and an object-sidesurface of the following lens element need to have accurate curvature toensure these two lens elements will be highly cemented. However, duringthe cementing process, those two lens elements might not be highlycemented due to displacement and it is thereby not favorable for theimage quality. Therefore, there is an air gap in a paraxial regionbetween every two of the lens elements of the photographing optical lenssystem that are adjacent to each other in the present disclosure forsolving the problem generated by the cemented lens elements.

The first lens element can have positive refractive power. The firstlens element can have an object-side surface being convex in a paraxialregion thereof. Therefore, it is favorable for reducing a back focallength of the photographing optical lens system.

The second lens element has positive refractive power. Therefore, it isfavorable for arranging the lens element having strong refractive powernear the middle section of the photographing optical lens system so asto prevent the lens element with strong refractive power havingexcessive curvature, and thereby preventing the molding problems.

Each of the third lens element, the fourth lens element, the fifth lenselement and the sixth lens element can have positive or negativerefractive power. Therefore, the refractive power distribution of thephotographing optical lens system is proper so that it is favorable forcorrecting the aberration and enlarging the field of view.

The seventh lens element can have positive refractive power. The seventhlens element can have an image-side surface being concave in a paraxialregion thereof. Therefore, it is favorable with the principal pointbeing positioned away from the image side of the photographing opticallens system for reducing the back focal length, and thereby maintaininga compact size thereof. In some embodiments, the image-side surface ofthe seventh lens element can be convex in a paraxial region thereof forcorrecting the aberration.

The eighth lens element can have positive refractive power or negativerefractive power. The eighth lens element can have an object-sidesurface being convex in a paraxial region thereof and an image-sidesurface being concave in a paraxial region thereof. The image-sidesurface of the eighth lens element has at least one convex shape in anoff-axis region thereof. Therefore, it is favorable for reducing a totaltrack length of the photographing optical lens system and correcting theaberration. Furthermore, it is favorable for reducing the incident angleof the light projecting onto the image sensor so as to improve theimage-sensing efficiency of the image sensor, and thereby correcting theaberration of the off-axis field.

When an axial distance between the object-side surface of the first lenselement and the image-side surface of the eighth lens element is Td, afocal length of the photographing optical lens system is f, thefollowing condition is satisfied: Td/f<2.0. Therefore, it is favorablefor tightly arranging the lens elements so as to reduce the total tracklength of the photographing optical lens system. Preferably, thefollowing condition can also be satisfied: Td/f<1.50.

When a vertical distance between a non-axial critical point on theimage-side surface of the eighth lens element and an optical axis isYc82, the focal length of the photographing optical lens system is f,the following condition is satisfied: 0.10<Yc82/f<0.80. Therefore, it isfavorable for correcting the aberration and increasing the relativeillumination so as to improve the image resolution at the off-axisregion. Please refer to FIG. 25, which shows a schematic view of avertical distance between a non-axial critical point on an image-sidesurface of an eighth lens element and an optical axis in FIG. 1. Anon-axial critical point is not located on the optical axis and itstangent is perpendicular to the optical axis.

When an axial distance between the object-side surface of the first lenselement and an image surface is TL, a maximum image height of thephotographing optical lens system (half of a diagonal length of aneffective photosensitive area of the image sensor) is ImgH, thefollowing conditions is satisfied: TL/ImgH<3.0. Therefore, thephotographing optical lens system favorably satisfies the requirement ofcompact size and large image surface so as to be applied to anelectronic device having high resolution. Preferably, the followingcondition can also be satisfied: TL/ImgH<2.0. More preferably, thefollowing condition can also be satisfied: TL/ImgH<1.75.

When a curvature radius of the image-side surface of the eighth lenselement is R16, the focal length of the photographing optical lenssystem is f, the following condition is satisfied: 0.10<R16/f<1.0. Thus,it is favorable with the rear principal point being positioned close tothe object side of the photographing optical lens system for reducingthe back focal length of the photographing optical lens system.

When a maximum effective radius of the object-side surface of the firstlens element is Y11, a maximum effective radius of the image-sidesurface of the eighth lens element is Y82, the following condition canbe satisfied: Y11/Y82<1.25. Therefore, it is favorable for properlyarranging the lens elements so as to keep the photographing optical lenssystem compact. Preferably, the following condition can also besatisfied: Y11/Y82<1.0. More preferably, the following condition canalso be satisfied: Y11/Y82<0.75. Please refer to FIG. 25, which shows aschematic view of a maximum effective radius of an object-side surfaceof a first lens element and a maximum effective radius of an image-sidesurface of an eighth lens element in FIG. 1.

According to the present disclosure, the photographing optical lenssystem further includes a stop. When an axial distance between the stopand the image-side surface of the eighth lens element is Sd, the axialdistance between the object-side surface of the first lens element andthe image-side surface of the eighth lens element is Td, the followingconditions can be satisfied: 0.70<Sd/Td<1.20. Therefore, it is favorablefor balancing the total track length and the view angle characteristics.

When a sum of central thicknesses of the lens elements of thephotographing optical lens system is ΣCT (that is, a sum of centralthicknesses of the first lens element, the second lens element, thethird lens element, the fourth lens element, the fifth lens element, thesixth lens element, the seventh lens element and the eighth lenselement), an axial distance between the image-side surface of the eighthlens element and the image surface is BL, the following condition can besatisfied: 1.5<ΣCT/BL. Therefore, it is favorable for further reducingthe back focal length of the photographing optical lens system.Preferably, the following condition can also be satisfied:2.0<ΣCT/BL<10. More preferably, the following condition can also besatisfied: 2.5<ΣCT/BL<6.5. Much more preferably, the following conditioncan also be satisfied: 2.5<ΣCT/BL<6.0.

When a focal length of the first lens element is f1, a focal length ofthe second lens element is f2, the following condition can be satisfied:−0.25<f2/f1<1.25. Therefore, it is favorable for preventing therefractive power distribution from overloading at the object-side so asto reduce the sensitivity of the photographing optical lens system.

When the focal length of the photographing optical lens system is f, acomposite focal length of the first lens element, the second lenselement and the third lens element is f123, the following condition canbe satisfied: 0.30<f/f123<1.5. Therefore, it is favorable for properlyarranging the refractive power distribution of the first lens element,the second lens element and the third lens element so as to improve thechromatic aberration correction capability.

When a focal length of the second lens element is f2, a focal length ofthe seventh lens element is f7, the following condition can besatisfied: 1.0<|f7/f2|. Therefore, it is favorable for effectivelycorrecting the aberration with a large aperture configuration.

When the focal length of the second lens element is f2, the focal lengthof the seventh lens element is f7, the following condition can besatisfied: |f7/f2|<1.0. Therefore, the refractive power of the seventhlens element is favorable for reducing the total length of thephotographing optical lens system.

When a curvature radius of the object-side surface of the eighth lenselement is R15, the curvature radius of the image-side surface of theeighth lens element is R16, the following condition can be satisfied:−0.50<(R15+R16)/(R15−R16). Therefore, the curvature radii of theobject-side surface and the image-side surface of the eighth lenselement are proper for correcting the astigmatism.

According to the present disclosure, each of the first lens element, thesecond lens element, the third lens element, the fourth lens element,the fifth lens element, the sixth lens element and the seventh lenselement can have at least one inflection point. In detail, at least oneof the object-side surface and the image-side surface of each of thelens elements can have at least one inflection point. Therefore, it isfavorable for correcting the aberration of the off axis field.

When the focal length of the photographing optical lens system is f, acomposite focal length of the fourth lens element, the fifth lenselement and the sixth lens element is f456, the following condition canbe satisfied: |f/f456|<0.60. Therefore, the refractive powerdistribution of the fourth lens element, the fifth lens element and thesixth lens element are favorable for eliminating the stray light.

When the maximum image height of the photographing optical lens systemis ImgH, the focal length of the photographing optical lens system is f,the following condition can be satisfied: 0.65<ImgH/f<1.40. Therefore,it is favorable for enlarging the field of view. Preferably, thefollowing condition can also be satisfied: 0.70<ImgH/f<1.30.

When the axial distance between the object-side surface of the firstlens element and the image-side surface of the eighth lens element isTd, an entrance pupil diameter of the photographing optical lens systemis EPD, the following condition can be satisfied: Td/EPD<3.0. Therefore,it is favorable for the photographing optical lens system obtaining thecharacteristics of compactness and a large aperture.

According to the present disclosure, an aperture stop can be configuredas a front stop or a middle stop. A front stop disposed between animaged object and the first lens element can produce a telecentriceffect by providing a longer distance between an exit pupil and theimage surface and thereby improving the image-sensing efficiency of animage sensor (for example, CCD or CMOS). A middle stop disposed betweenthe first lens element and the image surface is favorable for enlargingthe view angle and thereby provides a wider field of view.

According to the present disclosure, the lens elements of thephotographing optical lens system can be made of glass or plasticmaterial. When the lens elements are made of glass material, therefractive power distribution of the photographing optical lens systemmay be more flexible to design. When the lens elements are made ofplastic material, the manufacturing cost can be effectively reduced.Furthermore, surfaces of each lens element can be arranged to beaspheric, since the aspheric surface of the lens element is easy to forma shape other than spherical surface so as to have more controllablevariables for eliminating the aberration thereof, and to furtherdecrease the required number of the lens elements. Therefore, the totaltrack length of the photographing optical lens system can also bereduced.

According to the present disclosure, each of an object-side surface andan image-side surface has a paraxial region and an off-axis region. Theparaxial region refers to the region of the surface where light raystravel close to the optical axis, and the off-axis region refers to theregion of the surface away from the paraxial region. Particularly, whenthe lens element has a convex surface, it indicates that the surface canbe convex in the paraxial region thereof; when the lens element has aconcave surface, it indicates that the surface can be concave in theparaxial region thereof. Moreover, when a region of refractive power orfocus of a lens element is not defined, it indicates that the region ofrefractive power or focus of the lens element can be in the paraxialregion thereof.

According to the present disclosure, an image surface of thephotographing optical lens system, based on the corresponding imagesensor, can be flat or curved, especially a curved surface being concavefacing towards the object side of the photographing optical lens system.

According to the present disclosure, the photographing optical lenssystem can include at least one stop, such as an aperture stop, a glarestop or a field stop. Said glare stop or said field stop is allocatedfor eliminating the stray light and thereby improving the image qualitythereof.

According to the present disclosure, an image capturing unit isprovided. The image capturing unit includes the aforementionedphotographing optical lens system of the present disclosure and an imagesensor, wherein the image sensor is disposed on the image side of theaforementioned photographing optical lens system, that is, the imagesensor can be disposed on or near an image surface of the aforementionedphotographing optical lens system. In some embodiments, the imagecapturing unit can further include a barrel member, a holding member ora combination thereof.

In FIG. 26, FIG. 27, and FIG. 28, an image capturing unit 10 may beinstalled in, but not limited to, an electronic device, including asmart phone (FIG. 26), a tablet personal computer (FIG. 27) or awearable device (FIG. 28). The electronic devices shown in the figuresare only exemplary for showing the image capturing unit of the presentdisclosure installed in an electronic device and are not limitedthereto. In some embodiments, the electronic device can further include,but not limited to, a display unit, a control unit, a storage unit, arandom access memory unit (RAM), a read only memory unit (ROM) or acombination thereof.

According to the present disclosure, the photographing optical lenssystem can be optionally applied to optical systems with a movablefocus. Furthermore, the photographing optical lens system is featuredwith good capability in the aberration correction and high imagequality, and can be applied to 3D (three-dimensional) image capturingapplications, in products such as digital cameras, mobile devices,digital tablets, wearable devices, smart televisions, networksurveillance devices, motion sensing input devices, dashboard cameras,vehicle backup cameras and other electronic imaging devices. Accordingto the above description of the present disclosure, the followingspecific embodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure. FIG. 2 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 1stembodiment. In FIG. 1, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 197. The photographingoptical lens system includes, in order from an object side to an imageside, a first lens element 110, an aperture stop 100, a second lenselement 120, a third lens element 130, a fourth lens element 140, afifth lens element 150, a sixth lens element 160, a seventh lens element170, an eighth lens element 180, an IR-cut filter 190 and an imagesurface 195, wherein the image sensor 197 is disposed on or near theimage surface 195 of the photographing optical lens system, and thephotographing optical lens system has a total of eight lens elements(110-180). There is an air gap in a paraxial region between every two ofthe lens elements that are adjacent to each other.

The first lens element 110 with negative refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being concave in a paraxial region thereof. Thefirst lens element 110 is made of plastic material and has theobject-side surface 111 and the image-side surface 112 being bothaspheric. Both the object-side surface 111 and the image-side surface112 of the first lens element 110 have at least one inflection point.

The second lens element 120 with positive refractive power has anobject-side surface 121 being convex in a paraxial region thereof and animage-side surface 122 being convex in a paraxial region thereof. Thesecond lens element 120 is made of plastic material and has theobject-side surface 121 and the image-side surface 122 being bothaspheric. The image-side surface 122 of the second lens element 120 hasat least one inflection point.

The third lens element 130 with negative refractive power has anobject-side surface 131 being convex in a paraxial region thereof and animage-side surface 132 being concave in a paraxial region thereof. Thethird lens element 130 is made of plastic material and has theobject-side surface 131 and the image-side surface 132 being bothaspheric. The object-side surface 131 of the third lens element 130 hasat least one inflection point.

The fourth lens element 140 with negative refractive power has anobject-side surface 141 being convex in a paraxial region thereof and animage-side surface 142 being concave in a paraxial region thereof. Thefourth lens element 140 is made of plastic material and has theobject-side surface 141 and the image-side surface 142 being bothaspheric. Both the object-side surface 141 and the image-side surface142 of the fourth lens element 140 have at least one inflection point.

The fifth lens element 150 with positive refractive power has anobject-side surface 151 being convex in a paraxial region thereof and animage-side surface 152 being convex in a paraxial region thereof. Thefifth lens element 150 is made of plastic material and has theobject-side surface 151 and the image-side surface 152 being bothaspheric. The object-side surface 151 of the fifth lens element 150 hasat least one inflection point.

The sixth lens element 160 with negative refractive power has anobject-side surface 161 being concave in a paraxial region thereof andan image-side surface 162 being convex in a paraxial region thereof. Thesixth lens element 160 is made of plastic material and has theobject-side surface 161 and the image-side surface 162 being bothaspheric. The image-side surface 162 of the sixth lens element 160 hasat least one inflection point.

The seventh lens element 170 with positive refractive power has anobject-side surface 171 being convex in a paraxial region thereof and animage-side surface 172 being concave in a paraxial region thereof. Theseventh lens element 170 is made of plastic material and has theobject-side surface 171 and the image-side surface 172 being bothaspheric. Both the object-side surface 171 and the image-side surface ofthe seventh lens element 170 have at least one inflection point.

The eighth lens element 180 with negative refractive power has anobject-side surface 181 being convex in a paraxial region thereof and animage-side surface 182 being concave in a paraxial region thereof. Theeighth lens element 180 is made of plastic material and has theobject-side surface 181 and the image-side surface 182 being bothaspheric. The object-side surface 181 of the eighth lens element 180 hasat least one inflection point. The image-side surface 182 has at leastone convex shape in an off-axis region thereof.

The IR-cut filter 190 is made of glass and located between the eighthlens element 180 and the image surface 195, and will not affect thefocal length of the photographing optical lens system.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{( {Y^{2}/R} )/( {1 + {{sqrt}( {1 - {( {1 + k} ) \times ( {Y/R} )^{2}}} )}} )} + {\sum\limits_{i}\;{({Ai}) \times ( Y^{i} )}}}},$

where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from an optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be,but is not limited to, 4, 6, 8, 10, 12, 14 and 16.

In the photographing optical lens system of the image capturing unitaccording to the 1st embodiment, when a focal length of thephotographing optical lens system is f, an f-number of the photographingoptical lens system is Fno, and half of a maximal field of view of thephotographing optical lens system is HFOV, these parameters have thefollowing values: f=5.38 millimeters (mm), Fno=1.90; and HFOV=39.0degrees (deg.).

When a sum of central thicknesses of the lens elements of thephotographing optical lens system is ΣCT, an axial distance between theimage-side surface 182 of the eighth lens element 180 and the imagesurface 195 is BL, the following condition is satisfied: ΣCT/BL=4.19.

When an axial distance between the stop 100 and the image-side surface182 of the eighth lens element 180 is Sd, an axial distance between theobject-side surface 111 of the first lens element 110 and the image-sidesurface 182 of the eighth lens element 180 is Td, the followingcondition is satisfied: Sd/Td=0.86.

When the axial distance between the object-side surface 111 of the firstlens element 110 and the image-side surface 182 of the eighth lenselement 180 is Td, the focal length of the photographing optical lenssystem is f, the following condition is satisfied: Td/f=1.15.

When the axial distance between the object-side surface 111 of the firstlens element 110 and the image-side surface 182 of the eighth lenselement 180 is Td, an entrance pupil diameter of the photographingoptical lens system is EPD, the following condition is satisfied:Td/EPD=2.18.

When an axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 195 is TL, a maximum image heightof the photographing optical lens system is ImgH, the followingcondition is satisfied:TL/ImgH=1.61.

When the maximum image height of the photographing optical lens systemis ImgH, the focal length of the photographing optical lens system is f,the following condition is satisfied: ImgH/f=0.83.

When a maximum effective radius of the object-side surface 111 of thefirst lens element 110 is Y11, a maximum effective radius of theimage-side surface 182 of the eighth lens element 180 is Y82, thefollowing condition is satisfied: Y11/Y82=0.49.

When a vertical distance between a non-axial critical point on theimage-side surface 182 of the eighth lens element 180 and an opticalaxis is Yc82, the focal length of the photographing optical lens systemis f, the following condition is satisfied: Yc82/f=0.34.

When a curvature radius of the object-side surface 181 of the eighthlens element 180 is R15, a curvature radius of the image-side surface182 of the eighth lens element 180 is R16, the following condition issatisfied: (R15+R16)/(R15−R16)=2.26.

When the curvature radius of the image-side surface 182 of the eighthlens element 180 is R16, the focal length of the photographing opticallens system is f, the following condition is satisfied: R16/f=0.39.

When a focal length of the first lens element 110 is f1, a focal lengthof the second lens element 120 is f2, the following condition issatisfied: f2/f1=−0.06.

When the focal length of the second lens element 120 is f2, a focallength of the seventh lens element 170 is 17, the following condition issatisfied: |f7/f2|=2.25.

When the focal length of the photographing optical lens system is f, acomposite focal length of the first lens element 110, the second lenselement 120 and the third lens element 130 is f123, the followingcondition is satisfied: f/f123=0.72.

When the focal length of the photographing optical lens system is f, acomposite focal length of the fourth lens element 140, the fifth lenselement 150 and the sixth lens element 160 is f456, the followingcondition is satisfied: |f/f456|=0.04.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 5.38 mm, Fno = 1.90, HFOV = 39.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 10.963 (ASP) 0.300 Plastic 1.639 23.5−79.40 2 8.918 (ASP) 0.541 3 Ape. Stop Plano −0.418 4 Lens 2 2.600 (ASP)0.826 Plastic 1.544 55.9 4.65 5 −82.275 (ASP) 0.085 6 Lens 3 3.639 (ASP)0.250 Plastic 1.639 23.5 −11.46 7 2.366 (ASP) 0.489 8 Lens 4 14.087(ASP) 0.460 Plastic 1.544 55.9 −172.22 9 12.104 (ASP) 0.194 10 Lens 59.630 (ASP) 0.498 Plastic 1.544 55.9 13.06 11 −26.566 (ASP) 0.227 12Lens 6 −3.441 (ASP) 0.300 Plastic 1.639 23.5 −15.65 13 −5.426 (ASP)0.158 14 Lens 7 2.922 (ASP) 0.761 Plastic 1.544 55.9 10.48 15 5.447(ASP) 0.600 16 Lens 8 5.483 (ASP) 0.904 Plastic 1.530 55.8 −7.18 172.119 (ASP) 0.500 18 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 19Plano 0.225 20 Image Plano — Note: Reference wavelength is 587.6 nm(d-line).

TABLE 2 Aspheric Coefficients Surface # 1 2 4 5 6 7 k= −3.5953E−08−1.1485E−09   6.3990E−02   8.9709E+01 −1.9293E+01 −1.2082E+01 A4=−3.8670E−03 −4.7098E−03 −2.6379E−03 −3.4701E−02 −4.1683E−02   4.0352E−02A6= −4.4128E−03 −7.0466E−03 −1.7924E−03   3.8498E−02   4.8140E−02−2.4297E−02 A8=   5.8119E−03   1.2794E−02   3.2548E−03 −2.3851E−02−2.5580E−02   2.3854E−02 A10= −3.0365E−03 −7.9666E−03 −1.1513E−03  9.0654E−03   7.6022E−03 −1.2011E−02 A12=   8.4197E−04   2.6532E−03  2.2455E−04 −1.7388E−03 −1.4856E−03   2.7355E−03 A14= −1.3055E−04−5.0003E−04 −2.8077E−05   8.9087E−05   1.1375E−04 −1.9952E−04 A16=  8.9849E−06   4.1833E−05 — — — — Surface # 8 9 10 11 12 13 k=−9.0000E+01 −8.6566E+01 −8.8998E+01   9.0000E+01   7.5382E−01−3.6587E+00 A4= −7.6064E−03 −1.0595E−02 −9.8981E−03 −4.5790E−02−1.1355E−02 −2.9572E−02 A6= −1.7187E−03 −4.5402E−03 −3.9092E−03  1.5441E−02   2.9125E−02   1.7968E−02 A8=   1.3999E−03 −1.3714E−04−8.2144E−04 −5.2708E−03 −2.0810E−02 −7.5162E−03 A10= −8.4247E−04−2.2027E−04 −1.2447E−05 −2.4647E−03   8.2603E−03   2.4541E−03 A12=  2.4084E−04 −1.4238E−04 −8.5031E−06   2.6960E−03 −1.5354E−03−4.7615E−04 A14= −5.5180E−05 — — −7.6310E−04   8.0269E−05   3.7487E−05A16= — — —   7.1821E−05 — — Surface # 14 15 16 17 k= −6.2967E+00−3.2987E+01 −1.7763E−01 −1.4446E+00 A4= −5.5453E−03   2.9770E−02−9.1756E−02 −7.8738E−02 A6= −5.2382E−03 −1.3832E−02   1.7425E−02  2.0511E−02 A8= −3.4590E−04   2.1223E−03 −1.1433E−03 −3.9552E−03 A10=  6.6278E−05 −1.6047E−04 −3.4758E−05   4.8899E−04 A12= −1.7729E−05  8.1785E−06   9.2161E−06 −3.6173E−05 A14=   3.7807E−06 −4.3265E−07−4.8622E−07   1.4490E−06 A16= —   1.4130E−08   8.6531E−09 −2.4047E−08

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-20 represent the surfacessequentially arranged from the object-side to the image-side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A16 represent the asphericcoefficients ranging from the 4th order to the 16th order. The tablespresented below for each embodiment are the corresponding schematicparameter and aberration curves, and the definitions of the tables arethe same as Table 1 and Table 2 of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure. FIG. 4 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 2ndembodiment. In FIG. 3, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 297. The photographingoptical lens system includes, in order from an object side to an imageside, a first lens element 210, an aperture stop 200, a second lenselement 220, a third lens element 230, a fourth lens element 240, afifth lens element 250, a sixth lens element 260, a seventh lens element270, an eighth lens element 280, an IR-cut filter 290 and an imagesurface 295, wherein the image sensor 297 is disposed on or near theimage surface 295 of the photographing optical lens system, thephotographing optical lens system has a total of eight lens elements(210-280). There is an air gap in a paraxial region between every two ofthe lens elements that are adjacent to each other.

The first lens element 210 with positive refractive power has anobject-side surface 211 being convex in a paraxial region thereof and animage-side surface 212 being concave in a paraxial region thereof. Thefirst lens element 210 is made of plastic material and has theobject-side surface 211 and the image-side surface 212 being bothaspheric. Both the object-side surface 211 and the image-side surface212 of the first lens element 210 have at least one inflection point.

The second lens element 220 with positive refractive power has anobject-side surface 221 being convex in a paraxial region thereof and animage-side surface 222 being concave in a paraxial region thereof. Thesecond lens element 220 is made of plastic material and has theobject-side surface 221 and the image-side surface 222 being bothaspheric. Both the object-side surface 221 and the image-side surface222 of the second lens element 220 have at least one inflection point.

The third lens element 230 with negative refractive power has anobject-side surface 231 being convex in a paraxial region thereof and animage-side surface 232 being concave in a paraxial region thereof. Thethird lens element 230 is made of plastic material and has theobject-side surface 231 and the image-side surface 232 being bothaspheric.

The fourth lens element 240 with positive refractive power has anobject-side surface 241 being convex in a paraxial region thereof and animage-side surface 242 being concave in a paraxial region thereof. Thefourth lens element 240 is made of plastic material and has theobject-side surface 241 and the image-side surface 242 being bothaspheric. Both the object-side surface 241 and the image-side surface242 of the fourth lens element 240 have at least one inflection point.

The fifth lens element 250 with positive refractive power has anobject-side surface 251 being convex in a paraxial region thereof and animage-side surface 252 being convex in a paraxial region thereof. Thefifth lens element 250 is made of plastic material and has theobject-side surface 251 and the image-side surface 252 being bothaspheric. The object-side surface 251 of the fifth lens element 250 hasat least one inflection point.

The sixth lens element 260 with negative refractive power has anobject-side surface 261 being concave in a paraxial region thereof andan image-side surface 262 being convex in a paraxial region thereof. Thesixth lens element 260 is made of plastic material and has theobject-side surface 261 and the image-side surface 262 being bothaspheric. The image-side surface 262 of the sixth lens element 260 hasat least one inflection point.

The seventh lens element 270 with positive refractive power has anobject-side surface 271 being convex in a paraxial region thereof and animage-side surface 272 being concave in a paraxial region thereof. Theseventh lens element 270 is made of plastic material and has theobject-side surface 271 and the image-side surface 272 being bothaspheric. Both the object-side surface 271 and the image-side surface272 of the seventh lens element 270 have at least one inflection point.

The eighth lens element 280 with negative refractive power has anobject-side surface 281 being convex in a paraxial region thereof and animage-side surface 282 being concave in a paraxial region thereof. Theeighth lens element 280 is made of plastic material and has theobject-side surface 281 and the image-side surface 282 being bothaspheric. The object-side surface 281 of the eighth lens element 280 hasat least one inflection point. The image-side surface 282 of the eighthlens element 280 has at least one convex shape in an off-axis regionthereof.

The IR-cut filter 290 is made of glass and located between the eighthlens element 280 and the image surface 295, and will not affect thefocal length of the photographing optical lens system.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 5.38 mm, Fno = 2.00, HFOV = 40.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 2.874 (ASP) 0.300 Plastic 1.544 55.916.96 2 3.971 (ASP) 0.541 3 Ape. Stop Plano −0.418 4 Lens 2 3.391 (ASP)0.826 Plastic 1.544 55.9 6.77 5 40.433 (ASP) 0.085 6 Lens 3 5.937 (ASP)0.250 Plastic 1.660 20.4 −12.60 7 3.406 (ASP) 0.489 8 Lens 4 7.918 (ASP)0.460 Plastic 1.544 55.9 509.07 9 8.045 (ASP) 0.194 10 Lens 5 27.927(ASP) 0.498 Plastic 1.544 55.9 19.63 11 −17.133 (ASP) 0.227 12 Lens 6−2.638 (ASP) 0.300 Plastic 1.660 20.4 −14.88 13 −3.788 (ASP) 0.158 14Lens 7 2.893 (ASP) 0.761 Plastic 1.544 55.9 8.31 15 7.339 (ASP) 0.600 16Lend 8 5.200 (ASP) 0.904 Plastic 1.544 55.9 −7.19 17 2.093 (ASP) 0.50018 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 19 Plano 0.225 20 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 4 Aspheric Coefficients Surface # 1 2 4 5 6 7 k= −6.2378E+00−3.0429E+01 −1.8685E+00   9.0000E+01 −6.7413E+00 −2.2149E+01 A4=  1.5032E−02   1.9550E−02 −1.1142E−02 −2.8743E−02 −4.7457E−02  3.7957E−02 A6= −1.8459E−02 −6.0905E−02   3.2918E−04   3.5858E−02  4.6517E−02 −2.5062E−02 A8=   1.0860E−02   5.8005E−02   4.0065E−03−2.3882E−02 −2.4391E−02   2.2582E−02 A10= −1.0753E−02 −4.5363E−02−7.3922E−04   8.8385E−03   7.8459E−03 −1.1240E−02 A12=   5.3990E−03  2.3974E−02   3.5531E−04 −1.8988E−03 −1.4864E−03   3.1594E−03 A14=−1.2816E−03 −7.0627E−03 −2.1132E−04   1.0296E−04   1.6228E−04−2.9926E−04 A16=   1.2072E−04   8.6605E−04 — — — — Surface # 8 9 10 1112 13 k= −1.9822E+01 −1.9656E+01   7.0763E+01   8.3990E+01   5.9033E−01  1.2064E+00 A4= −9.9833E−03 −9.5904E−03 −2.7377E−02 −5.6151E−02−1.5690E−02 −3.4432E−02 A6= −5.1320E−03 −4.1355E−03 −1.4277E−04  1.3699E−02   2.5980E−02   1.8654E−02 A8=   9.1576E−04 −3.5469E−04−1.7257E−03 −5.3174E−03 −2.1117E−02 −8.5968E−03 A10= −7.9375E−04  2.1809E−05 −8.1819E−05 −2.5829E−03   8.3233E−03   2.9344E−03 A12=  3.3899E−04 −1.3680E−05 −8.4208E−06   2.6606E−03 −1.5044E−03−6.1702E−04 A14= −3.1489E−05 −1.9656E+01   7.0763E+01 −7.6385E−04  8.5924E−05   5.7233E−05 A16= — — —   7.3491E−05 — — Surface # 14 15 1617 k= −3.0170E+00 −3.9053E−01 −8.7342E−01 −1.3555E+00 A4= −1.4794E−02  2.8155E−02 −8.4801E−02 −7.5499E−02 A6= −5.3234E−04 −1.4189E−02  1.4328E−02   1.8239E−02 A8= −1.5249E−03   2.1340E−03 −6.4328E−04−3.2200E−03 A10=   2.7166E−04 −1.5897E−04 −6.9541E−05   3.6791E−04 A12=−2.9872E−05   8.2550E−06   9.9798E−06 −2.5382E−05 A14=   2.7367E−06−4.3289E−07 −4.6390E−07   9.5420E−07 A16= —   1.3420E−08   7.7115E−09−1.4935E−08

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 5.38 Y11/Y82 0.39 Fno 2.00 Yc82/f 0.36 HFOV [deg.]40.0 (R15 + R16)/(R15 − R16) 2.35 ΣCT/BL 3.88 R16/f 0.39 Sd/Td 0.91f2/f1 0.40 Td/f 1.10 |f7/f2| 1.23 Td/EPD 2.19 f/f123 0.74 TL/ImgH 1.56|f/f456| 0.08 ImgH/f 0.83

3rd Embodiment

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 6 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 5, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 397. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 300, a first lens element 310, a second lenselement 320, a third lens element 330, a fourth lens element 340, afifth lens element 350, a sixth lens element 360, a seventh lens element370, an eighth lens element 380, an IR-cut filter 390 and an imagesurface 395, wherein the image sensor 397 is disposed on or near theimage surface 395 of the photographing optical lens system, thephotographing optical lens system has a total of eight lens elements(310-380). There is an air gap in a paraxial region between every two ofthe lens elements that are adjacent to each other.

The first lens element 310 with positive refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being concave in a paraxial region thereof. Thefirst lens element 310 is made of plastic material and has theobject-side surface 311 and the image-side surface 312 being bothaspheric. Both the object-side surface 311 and the image-side surface312 of the first lens element 110 have at least one inflection point.

The second lens element 320 with positive refractive power has anobject-side surface 321 being convex in a paraxial region thereof and animage-side surface 322 being convex in a paraxial region thereof. Thesecond lens element 320 is made of plastic material and has theobject-side surface 321 and the image-side surface 322 being bothaspheric. The object-side surface 321 of the second lens element 320 hasat least one inflection point.

The third lens element 330 with negative refractive power has anobject-side surface 331 being convex in a paraxial region thereof and animage-side surface 332 being concave in a paraxial region thereof. Thethird lens element 330 is made of plastic material and has theobject-side surface 331 and the image-side surface 332 being bothaspheric.

The fourth lens element 340 with positive refractive power has anobject-side surface 341 being concave in a paraxial region thereof andan image-side surface 342 being convex in a paraxial region thereof. Thefourth lens element 340 is made of plastic material and has theobject-side surface 341 and the image-side surface 342 being bothaspheric. The object-side surface 341 of the fourth lens element 340 hasat least one inflection point.

The fifth lens element 350 with negative refractive power has anobject-side surface 351 being concave in a paraxial region thereof andan image-side surface 352 being convex in a paraxial region thereof. Thefifth lens element 350 is made of plastic material and has theobject-side surface 351 and the image-side surface 352 being bothaspheric.

The sixth lens element 360 with negative refractive power has anobject-side surface 361 being concave in a paraxial region thereof andan image-side surface 362 being convex in a paraxial region thereof. Thesixth lens element 360 is made of plastic material and has theobject-side surface 361 and the image-side surface 362 being bothaspheric. The image-side surface 362 of the sixth lens element 360 hasat least one inflection point.

The seventh lens element 370 with positive refractive power has anobject-side surface 371 being convex in a paraxial region thereof and animage-side surface 372 being concave in a paraxial region thereof. Theseventh lens element 370 is made of plastic material and has theobject-side surface 371 and the image-side surface 372 being bothaspheric. Both the object-side surface 371 and the image-side surface372 of the seventh lens element 370 have at least one inflection point.

The eighth lens element 380 with negative refractive power has anobject-side surface 381 being convex in a paraxial region thereof and animage-side surface 382 being concave in a paraxial region thereof. Theeighth lens element 380 is made of plastic material and has theobject-side surface 381 and the image-side surface 382 being bothaspheric. The object-side surface 381 of the eighth lens element 380 hasat least one inflection point. The image-side surface 382 of the eighthlens element 380 has at least one convex shape in an off-axis regionthereof.

The IR-cut filter 390 is made of glass and located between the eighthlens element 380 and the image surface 395, and will not affect thefocal length of the photographing optical lens system.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 5.81 mm, Fno = 2.15, HFOV = 36.8 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.247 2 Lens 1 2.912 (ASP)0.300 Plastic 1.530 55.8 14.86 3 4.400 (ASP) 0.541 4 Lens 2 3.422 (ASP)0.826 Plastic 1.530 55.8 6.28 5 −113.850 (ASP) 0.085 6 Lens 3 8.606(ASP) 0.250 Plastic 1.660 20.4 −9.74 7 3.625 (ASP) 0.489 8 Lens 4−13.138 (ASP) 0.460 Plastic 1.544 56.0 19.71 9 −5.974 (ASP) 0.194 10Lens 5 −12.541 (ASP) 0.498 Plastic 1.544 56.0 −180.23 11 −14.526 (ASP)0.227 12 Lens 6 −3.808 (ASP) 0.300 Plastic 1.544 56.0 −10.65 13 −11.643(ASP) 0.158 14 Lens 7 2.754 (ASP) 0.761 Plastic 1.530 55.8 7.53 15 8.042(ASP) 0.600 16 Lens 8 6.279 (ASP) 0.904 Plastic 1.530 55.8 −7.50 172.273 (ASP) 0.500 18 IR-cut filter Plano 0.175 Glass 1.517 64.2 — 19Plano 0.313 20 Image Plano — Note: Reference wavelength is 587.6 nm(d-line).

TABLE 6 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −4.1921E+00−3.0253E+01 −4.5200E+00 −1.0000E+00 −7.4008E+00 −2.4258E+01 A4=  7.4694E−03   1.7245E−03 −1.6970E−02 −3.6869E−02 −4.8839E−02  3.7129E−02 A6= −7.8799E−05 −3.0815E−02 −1.4320E−03   3.4174E−02  4.5424E−02 −2.6022E−02 A8= −1.0297E−02   2.8194E−02   3.5310E−03−2.3745E−02 −2.4591E−02   2.1999E−02 A10=   1.1083E−02 −1.8658E−02−7.4065E−04   8.9068E−03   7.8526E−03 −1.1194E−02 A12= −7.2497E−03  8.3721E−03   4.2585E−04 −1.8950E−03 −1.4646E−03   3.1955E−03 A14=  2.4290E−03 −2.1611E−03 −1.9798E−04   1.2928E−04   1.4646E−04−3.4153E−04 A16= −3.2328E−04   2.3100E−04 — — — — Surface # 8 9 10 11 1213 k= −6.8928E+01 −2.9997E+01 −1.0000E+00   5.5771E+01   7.3103E−01  1.3091E+01 A4= −5.2816E−03   3.6509E−04 −2.8328E−02 −6.7026E−02−9.7606E−03 −4.2745E−02 A6= −7.0547E−03 −4.9043E−03 −8.8969E−04  1.6647E−02   2.3433E−02   1.8348E−02 A8=   4.8819E−04 −1.3828E−03−8.6456E−04 −4.5576E−03 −2.1493E−02 −7.5822E−03 A10= −7.9619E−04−1.1801E−04   1.1247E−04 −2.4623E−03   8.3459E−03   1.5933E−03 A12=  3.4828E−04   6.8011E−05 −7.1602E−05   2.6821E−03 −1.4758E−03−1.7304E−04 A14=   8.8661E−06 — — −7.6011E−04   9.7767E−05   1.0052E−05A16= — — —   7.2465E−05 — — Surface # 14 15 16 17 k= −2.4455E+00  1.6072E+00   8.1920E−01 −1.1262E+00 A4= −1.7663E−02   2.9633E−02−6.4987E−02 −6.1069E−02 A6=   1.0528E−03 −1.4103E−02   8.0334E−03  1.2535E−02 A8= −1.8997E−03   2.1195E−03   5.8955E−04 −1.9537E−03 A10=  3.6232E−04 −1.5946E−04 −2.2684E−04   2.0245E−04 A12= −3.8826E−05  8.2564E−06   2.2110E−05 −1.2897E−05 A14=   2.6403E−06 −4.3068E−07−9.7262E−07   4.5384E−07 A16= —   1.3696E−08   1.6538E−08 −6.7304E−09

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 5.81 Y11/Y82 0.35 Fno 2.15 Yc82/f 0.38 HFOV [deg.]36.8 (R15 + R16)/(R15 − R16) 2.14 ΣCT/BL 4.30 R16/f 0.39 Sd/Td 0.96f2/f1 0.42 Td/f 1.10 |f7/f2| 1.20 Td/EPD 2.37 f/f123 0.81 TL/ImgH 1.68|f/f456| 0.29 ImgH/f 0.77

4th Embodiment

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure. FIG. 8 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 4thembodiment. In FIG. 7, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 497. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 400, a first lens element 410, a second lenselement 420, a third lens element 430, a fourth lens element 440, afifth lens element 450, a sixth lens element 460, a seventh lens element470, an eighth lens element 480, an IR-cut filter 490 and an imagesurface 495, wherein the image sensor 497 is disposed on or near theimage surface 495 of the photographing optical lens system, thephotographing optical lens system has a total of eight lens elements(410-480). There is an air gap in a paraxial region between every two ofthe lens elements that are adjacent to each other.

The first lens element 410 with positive refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being concave in a paraxial region thereof. Thefirst lens element 410 is made of plastic material and has theobject-side surface 411 and the image-side surface 412 being bothaspheric. The image-side surface 412 of the first lens element 410 hasat least one inflection point.

The second lens element 420 with positive refractive power has anobject-side surface 421 being convex in a paraxial region thereof and animage-side surface 422 being concave in a paraxial region thereof. Thesecond lens element 420 is made of plastic material and has theobject-side surface 421 and the image-side surface 422 being bothaspheric. Both the object-side surface 421 and the image-side surface422 of the second lens element 420 have at least one inflection point.

The third lens element 430 with negative refractive power has anobject-side surface 431 being convex in a paraxial region thereof and animage-side surface 432 being concave in a paraxial region thereof. Thethird lens element 430 is made of plastic material and has theobject-side surface 431 and the image-side surface 432 being bothaspheric. The object-side surface 431 of the third lens element 430 hasat least one inflection point.

The fourth lens element 440 with negative refractive power has anobject-side surface 441 being concave in a paraxial region thereof andan image-side surface 442 being convex in a paraxial region thereof. Thefourth lens element 440 is made of plastic material and has theobject-side surface 441 and the image-side surface 442 being bothaspheric. The object-side surface 441 of the fourth lens element 440 hasat least one inflection point.

The fifth lens element 450 with positive refractive power has anobject-side surface 451 being convex in a paraxial region thereof and animage-side surface 452 being convex in a paraxial region thereof. Thefifth lens element 450 is made of plastic material and has theobject-side surface 451 and the image-side surface 452 being bothaspheric. Both the object-side surface 451 and the image-side surface452 of the fifth lens element 450 have at least one inflection point.

The sixth lens element 460 with negative refractive power has anobject-side surface 461 being concave in a paraxial region thereof andan image-side surface 462 being concave in a paraxial region thereof.The sixth lens element 460 is made of plastic material and has theobject-side surface 461 and the image-side surface 462 being bothaspheric. Both the object-side surface 461 and the image-side surface462 of the sixth lens element 460 have at least one inflection point.

The seventh lens element 470 with positive refractive power has anobject-side surface 471 being convex in a paraxial region thereof and animage-side surface 472 being concave in a paraxial region thereof. Theseventh lens element 470 is made of plastic material and has theobject-side surface 471 and the image-side surface 472 being bothaspheric. Both the object-side surface 471 and the image-side surface472 of the seventh lens element 470 have at least one inflection point.

The eighth lens element 480 with negative refractive power has anobject-side surface 481 being concave in a paraxial region thereof andan image-side surface 482 being concave in a paraxial region thereof.The eighth lens element 480 is made of plastic material and has theobject-side surface 481 and the image-side surface 482 being bothaspheric. The object-side surface 481 of the eighth lens element 480 hasat least one inflection point. The image-side surface 482 of the eighthlens element 480 has at least one convex shape in an off-axis regionthereof.

The IR-cut filter 490 is made of glass and located between the eighthlens element 480 and the image surface 495, and will not affect thefocal length of the photographing optical lens system.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 7.74 mm, Fno = 2.19, HFOV = 37.1 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.394 2 Lens 1 3.592 (ASP)0.478 Plastic 1.535 55.7 18.29 3 5.412 (ASP) 0.269 4 Lens 2 5.309 (ASP)0.719 Plastic 1.544 56.0 10.04 5 183.235 (ASP) 0.050 6 Lens 3 9.205(ASP) 0.350 Plastic 1.660 20.4 −15.04 7 4.704 (ASP) 0.951 8 Lens 4−9.981 (ASP) 0.372 Plastic 1.584 28.2 −136.22 9 −11.569 (ASP) 0.245 10Lens 5 31.598 (ASP) 0.464 Plastic 1.544 56.0 20.56 11 −17.226 (ASP)0.138 12 Lens 6 −5.670 (ASP) 0.633 Plastic 1.544 56.0 −9.77 13 88.329(ASP) 0.092 14 Lens 7 2.648 (ASP) 1.122 Plastic 1.544 56.0 7.03 15 7.321(ASP) 1.840 16 Lens 8 −99.548 (ASP) 0.934 Plastic 1.544 56.0 −7.32 174.163 (ASP) 0.500 18 IR-cut filter Plano 0.210 Glass 1.517 64.2 — 19Plano 0.336 20 Image Plano — Note: Reference wavelength is 587.6 nm(d-line).

TABLE 8 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −3.6591E+00−2.0197E+01 −5.0324E+00 −1.0000E+00 −5.6195E+00 −2.1734E+01 A4=  4.0566E−03   1.0732E−03 −8.2331E−03 −1.6405E−02 −2.0112E−02  1.5639E−02 A6=   1.4272E−04 −5.8300E−03 −9.6310E−04   7.3921E−03  1.0189E−02 −6.0842E−03 A8= −1.0427E−03   3.2053E−03   4.0402E−04−2.9594E−03 −3.1824E−03   2.7588E−03 A10=   6.3231E−04 −1.3623E−03−4.1634E−05   6.1540E−04   5.5217E−04 −7.7156E−04 A12= −2.3511E−04  3.9110E−04   2.0869E−05 −7.8700E−05 −5.5034E−05   1.2664E−04 A14=  4.3392E−05 −6.2408E−05 −5.7071E−06   3.2919E−06   3.2207E−06−8.3124E−06 A16= −2.8704E−06   4.4465E−06 — — — — Surface # 8 9 10 11 1213 k= −1.4795E+01 −7.4790E+01 −1.0000E+00   3.7178E+01   7.4230E−03−9.0000E+01 A4= −1.8837E−03 −3.2467E−03 −1.1473E−02 −4.1630E−02−2.9429E−03 −1.1561E−02 A6= −1.5886E−03 −9.3260E−04   2.4901E−04  1.5088E−02   5.4203E−03 −6.9350E−04 A8=   1.1800E−04 −8.4165E−05−9.2783E−05 −4.4880E−03 −2.7037E−03   1.3772E−04 A10= −3.4619E−05−6.9360E−07   3.5601E−06   8.1477E−04   5.8579E−04 −2.9013E−05 A12=  1.5165E−05   2.3815E−06 −2.9812E−06 −6.6283E−05 −5.7307E−05  3.0804E−06 A14= −6.9091E−07 — —   6.4566E−07   2.1185E−06 −1.1551E−07A16= — — —   1.4828E−07 — — Surface # 14 15 16 17 k= −3.5569E+00  1.2666E+00 −1.4986E+01 −8.1535E−01 A4= −7.5544E−03   1.2691E−02−2.2298E−02 −2.2702E−02 A6=   8.6719E−04 −3.8733E−03   9.9415E−04  2.2032E−03 A8= −3.9812E−04   4.2689E−04   2.0078E−04 −1.6800E−04 A10=  4.6305E−05 −2.6275E−05 −2.6032E−05   8.5055E−06 A12= −2.6926E−06  9.2849E−07   1.3178E−06 −2.7972E−07 A14=   7.1494E−08 −1.7290E−08−3.2161E−08   5.6947E−09 A16= —   1.2274E−10   3.1334E−10 −5.5153E−11

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 7.74 Y11/Y82 0.35 Fno 2.19 Yc82/f 0.29 HFOV [deg.]37.1 (R15 + R16)/(R15 − R16) 0.92 ΣCT/BL 4.85 R16/f 0.54 Sd/Td 0.95f2/f1 0.55 Td/f 1.12 |f7/f2| 0.70 Td/EPD 2.45 f/f123 0.74 TL/ImgH 1.62|f/f456| 0.47 ImgH/f 0.77

5th Embodiment

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure. FIG. 10 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 5thembodiment. In FIG. 9, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 597. The photographingoptical lens system includes, in order from an object side to an imageside, a first lens element 510, an aperture stop 500, a second lenselement 520, a third lens element 530, a fourth lens element 540, afifth lens element 550, a sixth lens element 560, a seventh lens element570, an eighth lens element 580, an IR-cut filter 590 and an imagesurface 595, wherein the image sensor 597 is disposed on or near theimage surface 595 of the photographing optical lens system, thephotographing optical lens system has a total of eight lens elements(510-580). There is an air gap in a paraxial region between every two ofthe lens elements that are adjacent to each other.

The first lens element 510 with positive refractive power has anobject-side surface 511 being concave in a paraxial region thereof andan image-side surface 512 being convex in a paraxial region thereof. Thefirst lens element 510 is made of plastic material and has theobject-side surface 511 and the image-side surface 512 being bothaspheric. Both the object-side surface 511 and the image-side surface512 of the first lens element 510 have at least one inflection point.

The second lens element 520 with positive refractive power has anobject-side surface 521 being convex in a paraxial region thereof and animage-side surface 522 being convex in a paraxial region thereof. Thesecond lens element 520 is made of plastic material and has theobject-side surface 521 and the image-side surface 522 being bothaspheric.

The third lens element 530 with negative refractive power has anobject-side surface 531 being convex in a paraxial region thereof and animage-side surface 532 being concave in a paraxial region thereof. Thethird lens element 530 is made of plastic material and has theobject-side surface 531 and the image-side surface 532 being bothaspheric. Both the object-side surface 531 and the image-side surface532 of the third lens element 530 have at least one inflection point.

The fourth lens element 540 with positive refractive power has anobject-side surface 541 being convex in a paraxial region thereof and animage-side surface 542 being concave in a paraxial region thereof. Thefourth lens element 540 is made of plastic material and has theobject-side surface 541 and the image-side surface 542 being bothaspheric. Both the object-side surface 541 and the image-side surface542 of the fourth lens element 540 have at least one inflection point.

The fifth lens element 550 with positive refractive power has anobject-side surface 551 being concave in a paraxial region thereof andan image-side surface 552 being convex in a paraxial region thereof. Thefifth lens element 550 is made of plastic material and has theobject-side surface 551 and the image-side surface 552 being bothaspheric. Both the object-side surface 551 and the image-side surface552 of the fifth lens element 550 have at least one inflection point.

The sixth lens element 560 with negative refractive power has anobject-side surface 561 being convex in a paraxial region thereof and animage-side surface 562 being concave in a paraxial region thereof. Thesixth lens element 560 is made of plastic material and has theobject-side surface 561 and the image-side surface 562 being bothaspheric. Both the object-side surface 561 and the image-side surface562 of the sixth lens element 560 have at least one inflection point.

The seventh lens element 570 with positive refractive power has anobject-side surface 571 being concave in a paraxial region thereof andan image-side surface 572 being convex in a paraxial region thereof. Theseventh lens element 570 is made of plastic material and has theobject-side surface 571 and the image-side surface 572 being bothaspheric. Both the object-side surface 571 and the image-side surface572 of the seventh lens element 570 have at least one inflection point.

The eighth lens element 580 with negative refractive power has anobject-side surface 581 being convex in a paraxial region thereof and animage-side surface 582 being concave in a paraxial region thereof. Theeighth lens element 580 is made of plastic material and has theobject-side surface 581 and the image-side surface 582 being bothaspheric. The object-side surface 581 of the eighth lens element 580 hasat least one inflection point. The image-side surface 582 of the eighthlens element 580 has at least one convex shape in an off-axis regionthereof.

The IR-cut filter 590 is made of glass and located between the eighthlens element 580 and the image surface 595, and will not affect thefocal length of the photographing optical lens system.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 4.35 mm, Fno = 2.15, HFOV = 42.9 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 −3.102 (ASP) 0.668 Plastic 1.544 55.942.41 2 −2.942 (ASP) 0.270 3 Ape. Stop Plano −0.208 4 Lens 2 2.906 (ASP)0.548 Plastic 1.544 55.9 5.09 5 −55.180 (ASP) 0.050 6 Lens 3 6.703 (ASP)0.300 Plastic 1.639 23.5 −9.66 7 3.157 (ASP) 0.237 8 Lens 4 2.886 (ASP)0.300 Plastic 1.544 55.9 38.13 9 3.229 (ASP) 0.444 10 Lens 5 −15.063(ASP) 0.513 Plastic 1.544 55.9 7.67 11 −3.308 (ASP) 0.053 12 Lens 690.626 (ASP) 0.300 Plastic 1.639 23.5 −9.23 13 5.529 (ASP) 0.522 14 Lens7 −5.196 (ASP) 0.622 Plastic 1.544 55.9 3.20 15 −1.360 (ASP) 0.234 16Lend 8 15.294 (ASP) 0.656 Plastic 1.544 55.9 −2.64 17 1.292 (ASP) 0.60018 IR-cut filter Plano 0.175 Glass 1.517 64.2 — 19 Plano 0.469 20 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 10 Aspheric Coefficients Surface # 1 2 4 5 6 7 k= −8.9821E−01−2.8571E+00  3.3915E−02 −1.0144E+01  0.0000E+00 −1.0000E+00 A4= 9.4311E−04  8.6990E−03 −3.8333E−03 −9.6166E−02 −8.9886E−02 −5.5193E−02A6=  3.7919E−03  4.6841E−03  3.5926E−03  8.2569E−02  9.4471E−02 4.6024E−02 A8=  1.0642E−04 −1.1333E−03 −2.0766E−03 −2.8338E−02−3.8713E−02 −2.0902E−02 A10= −2.4498E−04  3.8816E−04 −4.4465E−03−1.4921E−02 −9.1934E−03  5.1891E−03 A12= −3.9527E−05 −6.2368E−05 1.1191E−02  2.0027E−02  1.2851E−02 −3.1647E−03 A14=  4.2884E−05−1.1405E−12 −5.5323E−03 −8.0878E−03 −5.4479E−03  5.8218E−04 A16=−6.9645E−06 −1.5462E−13 — — — — Surface # 8 9 10 11 12 13 k= −8.5979E+00 1.0756E+00 −4.4013E+00 −1.6135E+01 −1.0000E+00 −1.0000E+00 A4=−1.7066E−02 −3.3435E−02 −3.0970E−02  2.4901E−02  7.0532E−02 −1.4278E−03A6= −6.7120E−03 −3.8165E−03  5.9231E−02 −5.7583E−02 −1.0990E−01−3.3651E−02 A8= −7.9919E−03 −6.4824E−03 −9.7140E−02  1.3929E−02 6.7156E−02  2.0620E−02 A10=  1.7256E−03  2.6701E−04  9.2985E−02 1.8826E−03 −2.8321E−02 −7.4388E−03 A12= — — −5.0291E−02 −2.6137E−04 7.9887E−03  1.6595E−03 A14= — —  1.4651E−02  1.0591E−05 −1.0464E−03−1.6148E−04 A16= — — −1.7671E−03 — — — Surface # 14 15 16 17 k=−1.3757E+01 −4.6387E+00 −1.1322E+00 −6.0187E+00 A4=  6.6545E−02 2.9481E−02 −3.1311E−02 −3.3691E−02 A6= −3.4484E−02 −2.1247E−03−2.1322E−02  5.3795E−03 A8= −8.0958E−05 −1.0677E−02  1.0931E−02−6.5706E−04 A10=  3.7645E−03  5.5410E−03 −1.9476E−03  4.9447E−05 A12=−1.2056E−03 −1.0571E−03  1.5866E−04 −2.1154E−06 A14=  1.2351E−04 7.1183E−05 −4.9903E−06  3.8196E−08 A16= — — — —

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 4.35 Y11/Y82 0.50 Fno 2.15 Yc82/f 0.42 HFOV [deg.]42.9 (R15 + R16)/(R15 − R16) 1.18 ΣCT/BL 3.14 R16/f 0.30 Sd/Td 0.83f2/f1 0.12 Td/f 1.27 |f7/f2| 0.63 Td/EPD 2.72 f/f123 0.62 TL/ImgH 1.65|f/f456| 0.22 ImgH/f 0.94

6th Embodiment

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure. FIG. 12 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 6thembodiment. In FIG. 11, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 690. The photographingoptical lens system includes, in order from an object side to an imageside, a first lens element 610, a second lens element 620, an aperturestop 600, a third lens element 630, a fourth lens element 640, a fifthlens element 650, a sixth lens element 660, a seventh lens element 670,an eighth lens element 680, an IR-cut filter 690 and an image surface695, wherein the image sensor 697 is disposed on or near the imagesurface 695 of the photographing optical lens system, the photographingoptical lens system has a total of eight lens elements (610-680). Thereis an air gap in a paraxial region between every two of the lenselements that are adjacent to each other.

The first lens element 610 with negative refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being concave in a paraxial region thereof. Thesixth lens element 610 is made of plastic material and has theobject-side surface 611 and the image-side surface 612 being bothaspheric. Both the object-side surface 611 and the image-side surface612 of the sixth lens element 610 have at least one inflection point.

The second lens element 620 with positive refractive power has anobject-side surface 621 being convex in a paraxial region thereof and animage-side surface 622 being concave in a paraxial region thereof. Thesecond lens element 620 is made of plastic material and has theobject-side surface 621 and the image-side surface 622 being bothaspheric. The image-side surface 622 of the second lens element 620 hasat least one inflection point.

The third lens element 630 with positive refractive power has anobject-side surface 631 being convex in a paraxial region thereof and animage-side surface 632 being concave in a paraxial region thereof. Thethird lens element 630 is made of plastic material and has theobject-side surface 631 and the image-side surface 632 being bothaspheric. Both the object-side surface 631 and the image-side surface632 of the third lens element 630 have at least one inflection point.

The fourth lens element 640 with negative refractive power has anobject-side surface 641 being convex in a paraxial region thereof and animage-side surface 642 being concave in a paraxial region thereof. Thefourth lens element 640 is made of plastic material and has theobject-side surface 641 and the image-side surface 642 being bothaspheric. Both the object-side surface 641 and the image-side surface642 of the fourth lens element 640 have at least one inflection point.

The fifth lens element 650 with positive refractive power has anobject-side surface 651 being convex in a paraxial region thereof and animage-side surface 652 being convex in a paraxial region thereof. Thefifth lens element 650 is made of plastic material and has theobject-side surface 651 and the image-side surface 652 being bothaspheric. Both the object-side surface 651 and the image-side surface652 of the fifth lens element 650 have at least one inflection point.

The sixth lens element 660 with negative refractive power has anobject-side surface 661 being convex in a paraxial region thereof and animage-side surface 662 being concave in a paraxial region thereof. Thesixth lens element 660 is made of plastic material and has theobject-side surface 661 and the image-side surface 662 being bothaspheric. Both the object-side surface 661 and the image-side surface662 of the sixth lens element 660 have at least one inflection point.

The seventh lens element 670 with positive refractive power has anobject-side surface 671 being convex in a paraxial region thereof and animage-side surface 672 being convex in a paraxial region thereof. Theseventh lens element 670 is made of plastic material and has theobject-side surface 671 and the image-side surface 672 being bothaspheric. Both the object-side surface 671 and the image-side surface672 of the seventh lens element 670 have at least one inflection point.

The eighth lens element 680 with negative refractive power has anobject-side surface 681 being concave in a paraxial region thereof andan image-side surface 682 being concave in a paraxial region thereof.The eighth lens element 680 is made of plastic material and has theobject-side surface 681 and the image-side surface 682 being bothaspheric. The object-side surface 681 of the eighth lens element 680 hasat least one inflection point. The image-side surface 682 of the eighthlens element 680 has at least one convex shape in an off-axis regionthereof.

The IR-cut filter 690 is made of glass and located between the eighthlens element 680 and the image surface 695, and will not affect thefocal length of the photographing optical lens system.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 4.37 mm, Fno = 2.23, HFOV = 43.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 6.534 (ASP) 0.300 Plastic 1.650 21.4−32.56 2 4.902 (ASP) 0.089 3 Lens 2 2.815 (ASP) 0.476 Plastic 1.544 55.97.34 4 8.978 (ASP) 0.020 5 Ape. Stop Plano 0.041 6 Lens 3 5.034 (ASP)0.313 Plastic 1.544 55.9 34.71 7 6.713 (ASP) 0.057 8 Lens 4 3.116 (ASP)0.309 Plastic 1.639 23.5 −58.62 9 2.766 (ASP) 0.436 10 Lens 5 22.908(ASP) 0.678 Plastic 1.544 55.9 8.72 11 −5.919 (ASP) 0.050 12 Lens 68.401 (ASP) 0.300 Plastic 1.650 21.4 −7.31 13 2.991 (ASP) 0.221 14 Lens7 8.856 (ASP) 0.875 Plastic 1.544 55.9 2.82 15 −1.790 (ASP) 0.646 16Lend 8 −7.124 (ASP) 0.600 Plastic 1.544 55.9 −2.57 17 1.790 (ASP) 0.60018 IR-cut filter Plano 0.175 Glass 1.517 64.2 — 19 Plano 0.238 20 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line). An effectiveradius of the image-side surface of the seventh lens element is 2.250mm.

TABLE 12 Aspheric Coefficients Surface # 1 2 3 4 6 7 k=  1.4403E+00−2.2238E+00 −7.1178E−01 −2.1424E+00 −1.7709E+00  7.1291E+00 A4=−7.3737E−03 −1.2218E−02 −1.0010E−02 −9.9173E−02 −1.0543E−01 −4.8162E−02A6= −2.9638E−04  5.0339E−03  8.7286E−03  7.8475E−02  6.7551E−022.0949E−02 A8=  1.1939E−04 −3.2525E−04  6.9333E−03 −2.5920E−02−3.6088E−02 −3.5904E−02 A10=  8.0249E−05 −2.7100E−04 −8.3643E−03−1.1748E−02  6.4536E−04  1.9391E−02 A12= −1.7804E−04  5.5494E−04 8.5457E−03  2.2176E−02  7.9736E−03 −7.3885E−03 A14=  3.5287E−05−3.3860E−04 −1.6137E−03 −8.0878E−03 −5.4479E−03  2.8544E−03 A16=−4.1609E−06  1.3586E−12 — — — — Surface # 8 9 10 11 12 13 k= −9.8945E+00 3.2237E−02  3.0000E+00 −1.6209E+01 −1.0000E+00 −5.2317E+00 A4=−2.1993E−02 −4.0322E−02 −7.4609E−03  1.0709E−01 −2.8663E−02 −7.9395E−02A6= −6.4146E−04  2.5661E−03  3.8274E−02 −1.2277E−01  3.6211E−02 2.1986E−02 A8= −9.6316E−03 −2.4045E−02 −1.6583E−01 −1.7823E−02−1.2133E−01 −8.8514E−03 A10=  1.0280E−03  4.7933E−02  2.5162E−01 5.5108E−02  1.0244E−01  2.3358E−03 A12=  2.2265E−03 −4.9226E−02−2.0073E−01 −2.3525E−02 −4.3836E−02 −6.6435E−05 A14= −1.7139E−10 2.4607E−02  7.9569E−02  1.5959E−03  1.0552E−02 −2.0830E−05 A16=−1.3765E−11 −4.6238E−03 −1.2011E−02  7.9252E−04 −1.1329E−03 −2.4238E−06Surface # 14 15 16 17 k=  2.9984E+00 −4.3043E+00  1.9439E+00 −3.7453E+00A4=  8.3207E−02  4.6108E−02 −1.9210E−02 −7.2817E−02 A6= −1.3163E−01−4.3186E−02 −6.4360E−02  2.2620E−02 A8=  8.1940E−02  7.8101E−03 3.4437E−02 −5.3131E−03 A10= −2.9092E−02  3.4523E−03 −7.4305E−03 8.2513E−04 A12=  5.6246E−03 −1.4941E−03  8.2943E−04 −7.7886E−05 A14=−5.2046E−04  2.0252E−04 −4.7656E−05  3.9779E−06 A16=  1.6443E−05−9.5205E−06  1.1202E−06 −8.3555E−08

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 4.37 Y11/Y82 0.43 Fno 2.23 Yc82/f 0.37 HFOV [deg.]43.0 (R15 + R16)/(R15 − R16) 0.60 ΣCT/BL 3.80 R16/f 0.41 Sd/Td 0.84f2/f1 −0.23 Td/f 1.24 |f7/f2| 0.38 Td/EPD 2.76 f/f123 0.57 TL/ImgH 1.57|f/f456| 0.14 ImgH/f 0.94

7th Embodiment

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure. FIG. 14 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 7thembodiment. In FIG. 13, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 797. The photographingoptical lens system includes, in order from an object side to an imageside, a first lens element 710, an aperture stop 700, a second lenselement 720, a third lens element 730, a fourth lens element 740, afifth lens element 750, a sixth lens element 760, a seventh lens element770, an eighth lens element 780, an IR-cut filter 790 and an imagesurface 795, wherein the image sensor 797 is disposed on or near theimage surface 795 of the photographing optical lens system, thephotographing optical lens system has a total of eight lens elements(710-780). There is an air gap in a paraxial region between every two ofthe lens elements that are adjacent to each other.

The first lens element 710 with positive refractive power has anobject-side surface 711 being convex in a paraxial region thereof and animage-side surface 712 being concave in a paraxial region thereof. Thefirst lens element 710 is made of plastic material and has theobject-side surface 711 and the image-side surface 712 being bothaspheric. Both the object-side surface 711 and the image-side surface712 of the first lens element 710 have at least one inflection point.

The second lens element 720 with positive refractive power has anobject-side surface 721 being convex in a paraxial region thereof and animage-side surface 722 being planar in a paraxial region thereof. Thesecond lens element 720 is made of plastic material and has theobject-side surface 721 and the image-side surface 722 being bothaspheric. The image-side surface 722 of the second lens element 720 hasat least one inflection point.

The third lens element 730 with negative refractive power has anobject-side surface 731 being concave in a paraxial region thereof andan image-side surface 732 being concave in a paraxial region thereof.The third lens element 730 is made of plastic material and has theobject-side surface 731 and the image-side surface 732 being bothaspheric. The object-side surface 731 of the third lens element 730 hasat least one inflection point.

The fourth lens element 740 with positive refractive power has anobject-side surface 741 being convex in a paraxial region thereof and animage-side surface 742 being convex in a paraxial region thereof. Thefourth lens element 740 is made of plastic material and has theobject-side surface 741 and the image-side surface 742 being bothaspheric. Both the object-side surface 741 and the image-side surface742 of the fourth lens element 740 have at least one inflection point.

The fifth lens element 750 with negative refractive power has anobject-side surface 751 being concave in a paraxial region thereof andan image-side surface 752 being convex in a paraxial region thereof. Thefifth lens element 750 is made of plastic material and has theobject-side surface 751 and the image-side surface 752 being bothaspheric. Both the object-side surface 751 and the image-side surface752 of the fifth lens element 750 have at least one inflection point.

The sixth lens element 760 with positive refractive power has anobject-side surface 761 being concave in a paraxial region thereof andan image-side surface 762 being convex in a paraxial region thereof. Thesixth lens element 760 is made of plastic material and has theobject-side surface 761 and the image-side surface 762 being bothaspheric. Both the object-side surface 761 and the image-side surface762 of the sixth lens element 760 have at least one inflection point.

The seventh lens element 770 with negative refractive power has anobject-side surface 771 being concave in a paraxial region thereof andan image-side surface 772 being convex in a paraxial region thereof. Theseventh lens element 770 is made of plastic material and has theobject-side surface 771 and the image-side surface 772 being bothaspheric. Both the object-side surface 771 and the image-side surface772 of the seventh lens element 770 have at least one inflection point.

The eighth lens element 780 with negative refractive power has anobject-side surface 781 being concave in a paraxial region thereof andan image-side surface 782 being concave in a paraxial region thereof.The eighth lens element 780 is made of plastic material and has theobject-side surface 781 and the image-side surface 782 being bothaspheric. The object-side surface 781 of the eighth lens element 780 hasat least one inflection point. The image-side surface 782 of the eighthlens element 780 has at least one convex shape in an off-axis regionthereof.

The IR-cut filter 790 is made of glass and located between the eighthlens element 780 and the image surface 795, and will not affect thefocal length of the photographing optical lens system.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 4.90 mm, Fno = 2.30, HFOV = 38.4 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 2.314 (ASP) 0.476 Plastic 1.514 56.825.43 2 2.616 (ASP) 0.269 3 Ape. Stop Plano −0.208 4 Lens 2 1.987 (ASP)0.525 Plastic 1.544 55.9 3.65 5 ∞ (ASP) 0.050 6 Lens 3 −123.305 (ASP)0.350 Plastic 1.639 23.5 −5.85 7 3.858 (ASP) 0.394 8 Lens 4 9.875 (ASP)0.375 Plastic 1.544 55.9 16.56 9 −101.913 (ASP) 0.094 10 Lens 5 −6.207(ASP) 0.300 Plastic 1.530 55.8 −12.59 11 −90.462 (ASP) 0.337 12 Lens 6−69.277 (ASP) 0.400 Plastic 1.544 55.9 4.04 13 −2.135 (ASP) 0.090 14Lens 7 −8.012 (ASP) 0.460 Plastic 1.639 23.5 −16.33 15 −35.250 (ASP)0.635 16 Lend 8 −64.880 (ASP) 0.460 Plastic 1.544 55.9 −3.92 17 2.209(ASP) 0.500 18 IR-cut filter Plano 0.145 Glass 1.517 64.2 — 19 Plano0.248 20 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 14 Aspheric Coefficients Surface # 1 2 4 5 6 7 k= −2.1661E+00−1.0265E+01  6.3037E−01  0.0000E+00  3.0000E+00  2.8410E+00 A4= 6.6435E−03 −3.7944E−02 −9.2979E−02 −2.2174E−02 −1.3953E−02  7.2681E−03A6= −2.8943E−03 −5.2898E−03  2.5248E−02  3.3164E−02  5.0576E−02 3.3813E−02 A8= −7.4513E−03  1.2647E−02  6.1101E−03 −3.4384E−02−5.0095E−02 −3.3998E−02 A10=  5.1055E−03 −1.6575E−03 −8.5285E−03 3.2011E−02  1.8811E−02  1.9833E−02 A12= −3.9314E−03 −2.5743E−03 1.2977E−02 −3.3086E−03  7.9083E−03 −7.3749E−03 A14=  1.5975E−03−4.3887E−04 −5.1017E−03 −6.0295E−03 −1.0126E−02  1.8793E−03 A16=−2.9570E−04  4.3328E−04  3.7533E−12  4.0551E−12 −1.6060E−12  1.6663E−12Surface # 8 9 10 11 12 13 k= −3.6520E+01  3.0000E+00 −2.7107E+01−2.0000E+01  1.3646E+01 −6.9477E+00 A4= −4.6490E−02 −5.2989E−02−9.5180E−02 −8.7799E−02 −9.1926E−03  1.3809E−01 A6= −1.8771E−02−1.4869E−02  4.1322E−02  2.2875E−02  6.4452E−02 −1.2706E−01 A8= 5.5328E−04 −7.0092E−03  3.3203E−03 −1.7944E−02 −1.4120E−01  2.1032E−02A10= −8.9391E−03 −2.7390E−04 −7.3137E−05  4.2622E−02  1.0143E−01 1.7988E−02 A12=  2.8376E−03  7.3103E−03 −4.0798E−03 −3.4890E−02−3.5214E−02 −9.2422E−03 A14=  3.0592E−03 −2.0744E−03  1.8842E−03 1.1551E−02  5.9332E−03  1.6498E−03 A16=  5.6717E−10  2.1380E−04−2.4386E−04 −1.3396E−03 −3.8386E−04 −1.0645E−04 Surface # 14 15 16 17 k=−1.5646E+01  3.0000E+00  3.0000E+00 −5.7052E+00 A4=  2.1807E−01 9.2867E−02 −7.1382E−02 −6.7243E−02 A6= −2.8722E−01 −1.2680E−01−3.0448E−02  9.5976E−03 A8=  1.7069E−01  6.5586E−02  2.0903E−02 8.0719E−04 A10= −5.5257E−02 −1.8149E−02 −4.5453E−03 −6.3023E−04 A12 = 9.5908E−03  2.7414E−03  4.9389E−04  1.1085E−04 A14= −8.0717E−04−2.1123E−04 −2.7379E−05 −8.7247E−06 A16=  2.3571E−05  6.4688E−06 6.2003E−07  2.6242E−07

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 4.90 Y11/Y82 0.42 Fno 2.30 Yc82/f 0.26 HFOV [deg.]38.4 (R15 + R16)/(R15 − R16) 0.93 ΣCT/BL 3.75 R16/f 0.45 Sd/Td 0.85f2/f1 0.14 Td/f 1.02 |f7/f2| 4.47 Td/EPD 2.35 f/f123 0.81 TL/ImgH 1.47|f/f456| 1.12 ImgH/f 0.82

8th Embodiment

FIG. 15 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 16 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 8thembodiment. In FIG. 15, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 897. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 800, a first lens element 810, a second lenselement 820, a third lens element 830, a fourth lens element 840, afifth lens element 850, a sixth lens element 860, a seventh lens element870, an eighth lens element 880, an IR-cut filter 890 and an imagesurface 895, wherein the image sensor 897 is disposed on or near theimage surface 895 of the photographing optical lens system, thephotographing optical lens system has a total of eight lens elements(810-880). There is an air gap in a paraxial region between every two ofthe lens elements that are adjacent to each other.

The first lens element 810 with positive refractive power has anobject-side surface 811 being convex in a paraxial region thereof and animage-side surface 812 being concave in a paraxial region thereof. Thefirst lens element 810 is made of plastic material and has theobject-side surface 811 and the image-side surface 812 being bothaspheric. The image-side surface 812 of the first lens element 810 hasat least one inflection point.

The second lens element 820 with positive refractive power has anobject-side surface 821 being convex in a paraxial region thereof and animage-side surface 822 being convex in a paraxial region thereof. Thesecond lens element 820 is made of plastic material and has theobject-side surface 821 and the image-side surface 822 being bothaspheric. The image-side surface 822 of the second lens element 820 hasat least one inflection point.

The third lens element 830 with negative refractive power has anobject-side surface 831 being convex in a paraxial region thereof and animage-side surface 832 being concave in a paraxial region thereof. Thethird lens element 830 is made of plastic material and has theobject-side surface 831 and the image-side surface 832 being bothaspheric. The object-side surface 831 of the third lens element 830 hasat least one inflection point.

The fourth lens element 840 with negative refractive power has anobject-side surface 841 being concave in a paraxial region thereof andan image-side surface 842 being concave in a paraxial region thereof.The fourth lens element 840 is made of plastic material and has theobject-side surface 841 and the image-side surface 842 being bothaspheric. Both the object-side surface 841 and the image-side surface842 of the fourth lens element 840 have at least one inflection point.

The fifth lens element 850 with negative refractive power has anobject-side surface 851 being concave in a paraxial region thereof andan image-side surface 852 being concave in a paraxial region thereof.The fifth lens element 850 is made of plastic material and has theobject-side surface 851 and the image-side surface 852 being bothaspheric. Both the object-side surface 851 and the image-side surface852 of the fifth lens element 850 have at least one inflection point.

The sixth lens element 860 with positive refractive power has anobject-side surface 861 being convex in a paraxial region thereof and animage-side surface 862 being convex in a paraxial region thereof. Thesixth lens element 860 is made of plastic material and has theobject-side surface 861 and the image-side surface 862 being bothaspheric. Both the object-side surface 861 and the image-side surface862 of the sixth lens element 860 have at least one inflection point.

The seventh lens element 870 with negative refractive power has anobject-side surface 871 being concave in a paraxial region thereof andan image-side surface 872 being concave in a paraxial region thereof.The seventh lens element 870 is made of plastic material and has theobject-side surface 871 and the image-side surface 872 being bothaspheric. Both the object-side surface 871 and the image-side surface872 of the seventh lens element 870 have at least one inflection point.

The eighth lens element 880 with negative refractive power has anobject-side surface 881 being convex in a paraxial region thereof and animage-side surface 882 being concave in a paraxial region thereof. Theeighth lens element 880 is made of plastic material and has theobject-side surface 881 and the image-side surface 882 being bothaspheric. The object-side surface 881 of the eighth lens element 880 hasat least one inflection point. The image-side surface 882 of the eighthlens element 880 has at least one convex shape in an off-axis regionthereof.

The IR-cut filter 890 is made of glass and located between the eighthlens element 880 and the image surface 895, and will not affect thefocal length of the photographing optical lens system.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 5.25 mm, Fno = 2.45, HFOV = 36.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.266 2 Lens 1 2.159 (ASP)0.471 Plastic 1.530 55.8 18.10 3 2.576 (ASP) 0.050 4 Lens 2 2.321 (ASP)0.514 Plastic 1.544 55.9 3.98 5 −29.520 (ASP) 0.050 6 Lens 3 22.394(ASP) 0.350 Plastic 1.639 23.5 −5.85 7 3.182 (ASP) 0.454 8 Lens 4−101.913 (ASP) 0.447 Plastic 1.544 55.9 −127.10 9 214.965 (ASP) 0.050 10Lens 5 −27.597 (ASP) 0.619 Plastic 1.530 55.8 −16.51 11 12.909 (ASP)0.232 12 Lens 6 5.853 (ASP) 0.500 Plastic 1.544 55.9 3.95 13 −3.289(ASP) 0.090 14 Lens 7 −31.040 (ASP) 0.500 Plastic 1.639 23.5 −21.32 1524.401 (ASP) 0.573 16 Lens 8 11.477 (ASP) 0.500 Plastic 1.544 55.9 −4.3417 1.928 (ASP) 0.500 18 IR-cut filter Plano 0.145 Glass 1.517 64.2 — 19Plano 0.356 20 Image Plano — Note: Reference wavelength is 587.6 nm(d-line).

TABLE 16 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −1.1173E+00−1.0470E+01 −5.7611E−02 −1.0000E+00 −1.2723E+01  6.3789E−03 A4= 8.8316E−03 −3.7944E−02 −1.1235E−01 −2.4382E−02 −2.1778E−02 −3.3394E−03A6=  7.5525E−03 −5.2898E−03  2.5228E−02  3.3087E−02  4.2418E−02 2.2913E−02 A8= −1.7848E−02  1.2647E−02  8.7572E−03 −3.3511E−02−5.0955E−02 −3.1831E−02 A10=  2.2627E−02 −1.6575E−03 −2.9187E−03 2.5480E−02  1.7727E−02  2.2662E−02 A12= −1.9020E−02 −2.5743E−03 6.5557E−03 −4.2522E−03  5.6386E−03 −6.9149E−03 A14=  7.1247E−03−4.3887E−04 −1.7328E−03  1.1001E−03 −4.2319E−03  1.0005E−03 A16=−1.2481E−03  4.3328E−04  1.6191E−11  5.9252E−12  1.8163E−11 −1.2321E−04Surface # 8 9 10 11 12 13 k= −5.0000E+01 −5.0000E+01 −5.0000E+01−2.0000E+01  7.2815E+00 −2.4075E+01 A4= −3.9124E−02 −6.9947E−02−8.3134E−02 −8.4335E−02  5.8262E−03  7.4309E−02 A6= −8.5480E−03 8.9860E−03  3.8732E−02 −1.0543E−02 −1.9725E−02 −3.0823E−02 A8=−1.0463E−03  3.1519E−04  2.5736E−03  1.4706E−02 −2.1269E−02 −2.1700E−02A10= −1.3878E−03 −2.7922E−03  1.5077E−04  7.6720E−03  1.6122E−02 1.8585E−02 A12=  4.1908E−03  5.9093E−03 −4.0007E−03 −9.2211E−03−4.1165E−03 −5.2679E−03 A14=  2.1728E−03 −2.2588E−03  1.8830E−03 2.8096E−03  2.8339E−04  6.7829E−04 A16= −1.2555E−03  2.4227E−04−2.7172E−04 −2.7966E−04  2.0457E−05 −3.3852E−05 Surface # 14 15 16 17 k=−1.9743E+01  3.0000E+00 −2.0000E+01 −6.0395E+00 A4=  9.2727E−02 2.8093E−02 −1.1630E−01 −7.6739E−02 A6= −1.3710E−01 −6.6422E−02 1.5153E−02  2.2143E−02 A8=  7.6565E−02  3.5331E−02  3.6199E−03−3.9970E−03 A10= −2.2225E−02 −9.2579E−03 −1.2015E−03  4.4334E−04 A12= 3.5526E−03  1.3274E−03  1.3732E−04 −3.0376E−05 A14= −2.9506E−04−1.0007E−04 −7.3293E−06  1.2345E−06 A16=  9.7340E−06  3.1062E−06 1.5341E−07 −2.3431E−08

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 5.25 Y11/Y82 0.32 Fno 2.45 Yc82/f 0.26 HFOV [deg.]36.5 (R15 + R16)/(R15 − R16) 1.40 ΣCT/BL 3.90 R16/f 0.37 Sd/Td 0.95f2/f1 0.22 Td/f 1.03 |f7/f2| 5.36 Td/EPD 2.52 f/f123 0.84 TL/ImgH 1.60f/f456 1.03 ImgH/f 0.76

9th Embodiment

FIG. 17 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 18 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 9thembodiment. In FIG. 17, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 997. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 900, a first lens element 910, a second lenselement 920, a third lens element 930, a fourth lens element 940, afifth lens element 950, a sixth lens element 960, a seventh lens element970, an eighth lens element 980, an IR-cut filter 990 and an imagesurface 995, wherein the image sensor 997 is disposed on or near theimage surface 995 of the photographing optical lens system, thephotographing optical lens system has a total of eight lens elements(910-980). There is an air gap in a paraxial region between every two ofthe lens elements that are adjacent to each other.

The first lens element 910 with positive refractive power has anobject-side surface 911 being convex in a paraxial region thereof and animage-side surface 912 being concave in a paraxial region thereof. Thefirst lens element 910 is made of plastic material and has theobject-side surface 911 and the image-side surface 912 being bothaspheric. Both the object-side surface 911 and the image-side surface912 of the first lens element 910 have at least one inflection point.

The second lens element 920 with positive refractive power has anobject-side surface 921 being convex in a paraxial region thereof and animage-side surface 922 being convex in a paraxial region thereof. Thesecond lens element 920 is made of plastic material and has theobject-side surface 921 and the image-side surface 922 being bothaspheric. Both the object-side surface 921 and the image-side surface922 of the second lens element 920 have at least one inflection point.

The third lens element 930 with negative refractive power has anobject-side surface 931 being convex in a paraxial region thereof and animage-side surface 932 being concave in a paraxial region thereof. Thethird lens element 930 is made of plastic material and has theobject-side surface 931 and the image-side surface 932 being bothaspheric. The object-side surface 931 of the third lens element 930 hasat least one inflection point.

The fourth lens element 940 with positive refractive power has anobject-side surface 941 being convex in a paraxial region thereof and animage-side surface 942 being concave in a paraxial region thereof. Thefourth lens element 940 is made of plastic material and has theobject-side surface 941 and the image-side surface 942 being bothaspheric. Both the object-side surface 941 and the image-side surface942 of the fourth lens element 940 have at least one inflection point.

The fifth lens element 950 with negative refractive power has anobject-side surface 951 being convex in a paraxial region thereof and animage-side surface 952 being concave in a paraxial region thereof. Thefifth lens element 950 is made of plastic material and has theobject-side surface 951 and the image-side surface 952 being bothaspheric. Both the object-side surface 951 and the image-side surface952 of the fifth lens element 950 have at least one inflection point.

The sixth lens element 960 with positive refractive power has anobject-side surface 961 being convex in a paraxial region thereof and animage-side surface 962 being convex in a paraxial region thereof. Thesixth lens element 960 is made of plastic material and has theobject-side surface 961 and the image-side surface 962 being bothaspheric. Both the object-side surface 961 and the image-side surface962 of the sixth lens element 960 have at least one inflection point.

The seventh lens element 970 with negative refractive power has anobject-side surface 971 being planar in a paraxial region thereof and animage-side surface 972 being concave in a paraxial region thereof. Theseventh lens element 970 is made of plastic material and has theobject-side surface 971 and the image-side surface 972 being bothaspheric. Both the object-side surface 971 and the image-side surface972 of the seventh lens element 970 have at least one inflection point.

The eighth lens element 980 with negative refractive power has anobject-side surface 981 being convex in a paraxial region thereof and animage-side surface 982 being concave in a paraxial region thereof. Theeighth lens element 980 is made of plastic material and has theobject-side surface 981 and the image-side surface 982 being bothaspheric. The object-side surface 981 of the eighth lens element 980 hasat least one inflection point. The image-side surface 982 of the eighthlens element 980 has at least one convex shape in an off-axis regionthereof.

The IR-cut filter 990 is made of glass and located between the eighthlens element 980 and the image surface 995, and will not affect thefocal length of the photographing optical lens system.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 5.16 mm, Fno = 1.82, HFOV = 37.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.480 2 Lens 1 2.365 (ASP)0.592 Plastic 1.530 55.8 169.12 3 2.218 (ASP) 0.050 4 Lens 2 2.164 (ASP)0.500 Plastic 1.544 55.9 3.90 5 −104.892 (ASP) 0.050 6 Lens 3 9.517(ASP) 0.350 Plastic 1.639 23.5 −6.61 7 2.883 (ASP) 0.438 8 Lens 4 10.935(ASP) 0.587 Plastic 1.544 55.9 95.62 9 13.582 (ASP) 0.077 10 Lens 5101.913 (ASP) 0.600 Plastic 1.544 55.9 −38.13 11 17.202 (ASP) 0.300 12Lens 6 5.371 (ASP) 0.635 Plastic 1.544 55.9 4.33 13 −4.027 (ASP) 0.09014 Lens 7 ∞ (ASP) 0.510 Plastic 1.639 23.5 −14.92 15 9.532 (ASP) 0.36816 Lens 8 2.742 (ASP) 0.500 Plastic 1.544 55.9 −6.29 17 1.424 (ASP)0.500 18 IR-cut filter Plano 0.145 Glass 1.517 64.2 — 19 Plano 0.486 20Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 18 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −6.1633E−01−4.6935E+00 −1.6696E−01 −1.0000E+00 −5.0000E+01 −3.6749E+00 A4= 4.1471E−03 −3.7944E−02 −9.6723E−02 −3.5264E−02 −4.0153E−02 −9.3531E−03A6=  1.3823E−02 −5.2898E−03 −1.0946E−02  3.9482E−02  6.8981E−02 3.4304E−02 A8= −2.7045E−02  1.2647E−02  1.5466E−02 −3.3636E−02−5.4246E−02 −3.7266E−02 A10=  3.7565E−02 −1.6575E−03 −8.1248E−04 1.7693E−02  1.2851E−02  2.1110E−02 A12= −2.8085E−02 −2.5743E−03−2.8312E−03 −5.5380E−03  4.2199E−03 −6.7535E−03 A14=  1.0875E−02−4.3887E−04  1.5711E−04  1.5632E−03 −2.9487E−03  1.2829E−03 A16=−1.7349E−03  4.3328E−04  3.6681E−04 −5.5765E−05  3.9469E−04 −1.4186E−04Surface # 8 9 10 11 12 13 k=  2.5558E+00 −4.0832E+01 −5.0000E+01−2.0000E+01  5.5981E+00 −8.7463E+00 A4= −1.8886E−02 −7.2596E−02−1.1236E−01 −6.8599E−02  3.9586E−02  7.3517E−02 A6= −4.1268E−03 2.6352E−02  4.4805E−02 −4.3923E−02 −6.5741E−02 −3.4583E−02 A8= 5.8229E−04 −1.8597E−03  5.1484E−03  6.1911E−02  3.0873E−02 −4.3841E−03A10= −4.2897E−03 −6.8013E−03  3.1831E−04 −3.1864E−02 −1.1553E−02 6.3986E−03 A12=  8.4564E−04  5.4807E−03 −4.5513E−03  9.6080E−03 3.2870E−03 −1.8407E−03 A14=  1.4836E−03 −2.0808E−03  1.7160E−03−1.6484E−03 −6.0720E−04  2.3833E−04 A16= −4.2040E−04  3.1025E−04−1.9980E−04  1.1898E−04  4.7269E−05 −1.2123E−05 Surface # 14 15 16 17 k= 0.0000E+00 −1.4392E+01 −2.0000E+01 −4.2848E+00 A4= −4.4898E−03−3.4323E−02 −8.1983E−02 −7.4151E−02 A6= −4.7834E−02 −1.9783E−02−2.1184E−02  1.9138E−02 A8=  3.2977E−02  1.5191E−02  1.5720E−02−3.4425E−03 A10= −1.1111E−02 −4.3713E−03 −3.2459E−03  4.3310E−04 A12= 2.1352E−03  6.6283E−04  3.2905E−04 −3.5604E−05 A14= −2.2329E−04−5.2582E−05 −1.6885E−05  1.6618E−06 A16=  9.6511E−06  1.7195E−06 3.5196E−07 −3.2780E−08

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 9th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 5.16 Y11/Y82 0.42 Fno 1.82 Yc82/f 0.30 HFOV [deg.]37.0 (R15 + R16)/(R15 − R16) 3.16 ΣCT/BL 3.78 R16/f 0.28 Sd/Td 0.91f2/f1 0.02 Td/f 1.09 |f7/f2| 3.83 Td/EPD 1.99 f/f123 0.65 TL/ImgH 1.69|f/f456| 1.09 ImgH/f 0.78

10th Embodiment

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure. FIG. 20 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 10thembodiment. In FIG. 19, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 1090. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 1000, a first lens element 1010, a second lenselement 1020, a third lens element 1030, a fourth lens element 1040, afifth lens element 1050, a sixth lens element 1060, a seventh lenselement 1070, an eighth lens element 1080, an IR-cut filter 1090 and animage surface 1095, wherein the image sensor 1097 is disposed on or nearthe image surface 1095 of the photographing optical lens system, thephotographing optical lens system has a total of eight lens elements(1010-1080). There is an air gap in a paraxial region between every twoof the lens elements that are adjacent to each other.

The first lens element 1010 with positive refractive power has anobject-side surface 1011 being convex in a paraxial region thereof andan image-side surface 1012 being concave in a paraxial region thereof.The first lens element 1010 is made of plastic material and has theobject-side surface 1011 and the image-side surface 1012 being bothaspheric. The image-side surface 1012 of the first lens element 1010 hasat least one inflection point.

The second lens element 1020 with positive refractive power has anobject-side surface 1021 being convex in a paraxial region thereof andan image-side surface 1022 being concave in a paraxial region thereof.The second lens element 1020 is made of plastic material and has theobject-side surface 1021 and the image-side surface 1022 being bothaspheric. Both the object-side surface 1021 and the image-side surface1022 of the second lens element 1020 have at least one inflection point.

The third lens element 1030 with negative refractive power has anobject-side surface 1031 being convex in a paraxial region thereof andan image-side surface 1032 being concave in a paraxial region thereof.The third lens element 1030 is made of plastic material and has theobject-side surface 1031 and the image-side surface 1032 being bothaspheric. The object-side surface 1031 of the third lens element 1030has at least one inflection point.

The fourth lens element 1040 with positive refractive power has anobject-side surface 1041 being convex in a paraxial region thereof andan image-side surface 1042 being concave in a paraxial region thereof.The fourth lens element 1040 is made of plastic material and has theobject-side surface 1041 and the image-side surface 1042 being bothaspheric. Both the object-side surface 1041 and the image-side surface1042 of the fourth lens element 1040 have at least one inflection point.

The fifth lens element 1050 with negative refractive power has anobject-side surface 1051 being convex in a paraxial region thereof andan image-side surface 1052 being concave in a paraxial region thereof.The fifth lens element 1050 is made of plastic material and has theobject-side surface 1051 and the image-side surface 1052 being bothaspheric. Both the object-side surface 1051 and the image-side surface1052 of the fifth lens element 1050 have at least one inflection point.

The sixth lens element 1060 with positive refractive power has anobject-side surface 1061 being convex in a paraxial region thereof andan image-side surface 1062 being concave in a paraxial region thereof.The sixth lens element 1060 is made of plastic material and has theobject-side surface 1061 and the image-side surface 1062 being bothaspheric. Both the object-side surface 1061 and the image-side surface1062 of the sixth lens element 1060 have at least one inflection point.

The seventh lens element 1070 with negative refractive power has anobject-side surface 1071 being convex in a paraxial region thereof andan image-side surface 1072 being concave in a paraxial region thereof.The seventh lens element 1070 is made of plastic material and has theobject-side surface 1071 and the image-side surface 1072 being bothaspheric. Both the object-side surface 1071 and the image-side surface1072 of the seventh lens element 1070 have at least one inflectionpoint.

The eighth lens element 1080 with positive refractive power has anobject-side surface 1081 being convex in a paraxial region thereof andan image-side surface 1082 being concave in a paraxial region thereof.The eighth lens element 1080 is made of plastic material and has theobject-side surface 1081 and the image-side surface 1082 being bothaspheric. The object-side surface 1081 of the eighth lens element 1080has at least one inflection point. The image-side surface 1082 of theeighth lens element 1080 has at least one convex shape in an off-axisregion thereof.

The IR-cut filter 1090 is made of glass and located between the eighthlens element 1080 and the image surface 1095, and will not affect thefocal length of the photographing optical lens system.

The detailed optical data of the 10th embodiment are shown in Table 19and the aspheric surface data are shown in Table 20 below.

TABLE 19 10th Embodiment f = 5.14 mm, Fno = 1.69, HFOV = 37.1 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.511 2 Lens 1 2.378 (ASP)0.486 Plastic 1.530 55.8 489.74 3 2.230 (ASP) 0.091 4 Lens 2 2.186 (ASP)0.657 Plastic 1.544 56.0 4.17 5 54.015 (ASP) 0.050 6 Lens 3 7.787 (ASP)0.350 Plastic 1.660 20.4 −8.25 7 3.147 (ASP) 0.492 8 Lens 4 9.802 (ASP)0.501 Plastic 1.544 56.0 48.46 9 15.324 (ASP) 0.076 10 Lens 5 101.913(ASP) 0.505 Plastic 1.544 56.0 −24.38 11 11.717 (ASP) 0.140 12 Lens 64.554 (ASP) 0.500 Plastic 1.544 56.0 8.76 13 98.696 (ASP) 0.409 14 Lens7 2.925 (ASP) 0.459 Plastic 1.639 23.5 −9.92 15 1.879 (ASP) 0.232 16Lens 8 1.459 (ASP) 0.518 Plastic 1.544 56.0 102.59 17 1.311 (ASP) 0.50018 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 19 Plano 0.334 20 ImagePlano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 20 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −9.8108E−01−3.6952E+00 −9.3134E−02 −1.0000E+00 −1.1519E+01 −4.3052E+00 A4=−6.0307E−04 −4.4573E−02 −7.8639E−02 −3.2314E−02 −3.6378E−02 −3.3118E−03A6=  1.8274E−03  2.6111E−03  2.0735E−03  2.3386E−02  4.3720E−02 2.4048E−02 A8=  3.7792E−03  8.0974E−03 −8.3987E−03 −1.9581E−02−2.5581E−02 −2.0242E−02 A10= −4.6591E−03 −1.0522E−02  8.0907E−03 8.4297E−03  4.4103E−03  8.5976E−03 A12=  2.7599E−03  7.0875E−03−3.1393E−03 −1.8996E−03  1.3129E−03 −2.2355E−03 A14= −8.9818E−04−2.4320E−03  7.3571E−04  2.6301E−04 −6.6982E−04  4.1180E−04 A16= 1.2767E−04  3.7942E−04 −6.1766E−05 −3.4897E−05  8.2904E−05 −2.7832E−05Surface # 8 9 10 11 12 13 k=  1.5341E+00 −5.0000E+01 −2.4914E+01−1.8747E+01  3.6755E+00 −1.0000E+00 A4= −1.1167E−02 −7.8251E−02−1.3936E−01 −7.3602E−02  7.0596E−02  8.8705E−02 A6= −5.4080E−03 6.5959E−02  1.3207E−01 −5.9464E−03 −9.6064E−02 −3.9894E−02 A8= 4.9325E−04 −3.9078E−02 −7.4470E−02  2.4388E−02  5.9794E−02  4.8039E−03A10 −1.8069E−03  1.4042E−02  3.3551E−02 −1.2809E−02 −2.7626E−02 9.0214E−04 A12=  1.5440E−04 −2.8544E−03 −1.0407E−02  3.5994E−03 8.0321E−03 −4.2237E−04 A14=  4.1865E−04  2.3073E−04  1.8464E−03−5.0084E−04 −1.3266E−03  6.2122E−05 A16= −7.9240E−05  8.8830E−06−1.3982E−04  2.5693E−05  9.2682E−05 −3.3596E−06 Surface # 14 15 16 17 k= 0.0000E+00 −2.0000E+01 −1.2163E+01 −7.1627E+00 A4= −5.7697E−02 1.0521E−02 −1.5848E−01 −7.4149E−02 A6=  9.8666E−03 −2.2081E−02 7.1332E−02  2.4750E−02 A8= −1.4711E−02  3.1294E−03 −1.9746E−02−4.2144E−03 A10=  6.5394E−03  4.4537E−04  3.2665E−03  3.0069E−04 A12=−1.2754E−03 −1.5843E−04 −3.0793E−04  1.0423E−06 A14=  1.1892E−04 1.5536E−05  1.5290E−05 −1.2504E−06 A16= −4.4003E−06 −5.3342E−07−3.1104E−07  4.6955E−08

In the 10th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 10th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 19 and Table 20as the following values and satisfy the following conditions:

10th Embodiment f [mm] 5.14 Y11/Y82 0.45 Fno 1.69 Yc82/f 0.33 HFOV[deg.] 37.1 (R15 + R16)/(R15 − R16) 18.68 ΣCT/BL 3.51 R16/f 0.25 Sd/Td0.91 f2/f1 0.01 Td/f 1.06 |f7/f2| 2.38 Td/EPD 1.80 f/f123 0.70 TL/ImgH1.65 |f/f456| 0.47 ImgH/f 0.78

11th Embodiment

FIG. 21 is a schematic view of an image capturing unit according to the11th embodiment of the present disclosure. FIG. 22 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 11thembodiment. In FIG. 21, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 1197. The photographingoptical lens system includes, in order from an object side to an imageside, an aperture stop 1100, a first lens element 1110, a second lenselement 1120, a third lens element 1130, a fourth lens element 1140, afifth lens element 1150, a sixth lens element 1160, a seventh lenselement 1170, an eighth lens element 1180, an IR-cut filter 1190 and animage surface 1195, wherein the image sensor 1197 is disposed on or nearthe image surface 1195 of the photographing optical lens system, thephotographing optical lens system has a total of eight lens elements(1110-1180). There is an air gap in a paraxial region between every twoof the lens elements that are adjacent to each other.

The first lens element 1110 with positive refractive power has anobject-side surface 1111 being convex in a paraxial region thereof andan image-side surface 1112 being concave in a paraxial region thereof.The first lens element 1110 is made of plastic material and has theobject-side surface 1111 and the image-side surface 1112 being bothaspheric. The image-side surface 1112 of the first lens element 1110 hasat least one inflection point.

The second lens element 1120 with positive refractive power has anobject-side surface 1121 being convex in a paraxial region thereof andan image-side surface 1122 being convex in a paraxial region thereof.The second lens element 1120 is made of plastic material and has theobject-side surface 1121 and the image-side surface 1122 being bothaspheric. The object-side surface 1121 of the second lens element 1120has at least one inflection point.

The third lens element 1130 with negative refractive power has anobject-side surface 1131 being convex in a paraxial region thereof andan image-side surface 1132 being concave in a paraxial region thereof.The third lens element 1130 is made of plastic material and has theobject-side surface 1131 and the image-side surface 1132 being bothaspheric. The object-side surface 1131 of the third lens element 1130has at least one inflection point.

The fourth lens element 1140 with positive refractive power has anobject-side surface 1141 being convex in a paraxial region thereof andan image-side surface 1142 being convex in a paraxial region thereof.The fourth lens element 1140 is made of plastic material and has theobject-side surface 1141 and the image-side surface 1142 being bothaspheric. Both the object-side surface 1141 and the image-side surface1142 of the fourth lens element 1140 have at least one inflection point.

The fifth lens element 1150 with negative refractive power has anobject-side surface 1151 being concave in a paraxial region thereof andan image-side surface 1152 being convex in a paraxial region thereof.The fifth lens element 1150 is made of plastic material and has theobject-side surface 1151 and the image-side surface 1152 being bothaspheric. The image-side surface 1152 of the fifth lens element 1150 hasat least one inflection point.

The sixth lens element 1160 with positive refractive power has anobject-side surface 1161 being convex in a paraxial region thereof andan image-side surface 1162 being concave in a paraxial region thereof.The sixth lens element 1160 is made of plastic material and has theobject-side surface 1161 and the image-side surface 1162 being bothaspheric. Both the object-side surface 1161 and the image-side surface1162 of the sixth lens element 1160 have at least one inflection point.

The seventh lens element 1170 with positive refractive power has anobject-side surface 1171 being convex in a paraxial region thereof andan image-side surface 1172 being concave in a paraxial region thereof.The seventh lens element 1170 is made of plastic material and has theobject-side surface 1171 and the image-side surface 1172 being bothaspheric. Both the object-side surface 1171 and the image-side surface1172 of the seventh lens element 1170 have at least one inflectionpoint.

The eighth lens element 1180 with negative refractive power has anobject-side surface 1181 being convex in a paraxial region thereof andan image-side surface 1182 being concave in a paraxial region thereof.The eighth lens element 1180 is made of plastic material and has theobject-side surface 1181 and the image-side surface 1182 being bothaspheric. The object-side surface 1181 of the eighth lens element 1180has at least one inflection point. The image-side surface 1182 of theeighth lens element 1180 has at least one convex shape in an off-axisregion thereof.

The IR-cut filter 1190 is made of glass and located between the eighthlens element 1180 and the image surface 1195, and will not affect thefocal length of the photographing optical lens system.

The detailed optical data of the 11th embodiment are shown in Table 21and the aspheric surface data are shown in Table 22 below.

TABLE 21 11th Embodiment f = 6.41 mm, Fno = 1.93, HFOV = 44.0 deg. AbbeFocal Surface # Curvature Radius Thickness Material Index # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.456 2 Lens 1 3.064 (ASP)0.633 Plastic 1.544 55.9 17.88 3 4.147 (ASP) 0.176 4 Lens 2 5.668 (ASP)0.652 Plastic 1.544 55.9 10.04 5 −143.351 (ASP) 0.050 6 Lens 3 6.037(ASP) 0.350 Plastic 1.660 20.3 −17.84 7 3.899 (ASP) 0.633 8 Lens 426.729 (ASP) 0.752 Plastic 1.544 55.9 12.96 9 −9.478 (ASP) 0.148 10 Lens5 −6.084 (ASP) 0.500 Plastic 1.660 20.3 −9.73 11 −118.455 (ASP) 0.275 12Lens 6 5.852 (ASP) 0.753 Plastic 1.544 55.9 14.29 13 22.628 (ASP) 0.14814 Lens 7 4.014 (ASP) 0.600 Plastic 1.660 20.3 20.60 15 5.356 (ASP)0.782 16 Lens 8 3.284 (ASP) 0.750 Plastic 1.632 23.4 −8.64 17 1.870(ASP) 0.500 18 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 19 Plano0.596 20 Image Plano — Note: Reference wavelength is 587.6 nm (d−line).

TABLE 22 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −8.1870E−01−3.4704E+00  6.6794E−01 −1.0000E+00 −1.1173E+01 −5.3583E+00 A4=−2.9022E−04 −5.7097E−03 −1.6616E−02 −9.4157E−03 −7.7028E−03 −1.7777E−04A6=  3.3745E−03 −6.6698E−03 −2.8175E−03  7.1783E−04  3.4461E−03 1.9724E−03 A8= −4.4509E−03  5.8047E−03 −4.3049E−05 −4.2134E−04−1.4246E−03 −9.8895E−04 A10=  3.2471E−03 −4.5722E−03 −2.3890E−04 1.5548E−04  1.4459E−05  1.1766E−04 A12= −1.3370E−03  2.1590E−03 5.3485E−04 −3.5506E−05  1.2369E−05 −1.8125E−06 A14=  2.8507E−04−5.3559E−04 −2.0655E−04 −3.0015E−06  4.3660E−07  2.5777E−06 A16=−2.4708E−05  5.6847E−05  2.7164E−05  3.3368E−07  4.8966E−07  1.3015E−08Surface # 8 9 10 11 12 13 k= −1.1423E+01 −1.0000E+00 −3.8457E+01−1.4250E+01  1.5358E+00 −1.0000E+00 A4= −3.1141E−03 −4.2187E−03−4.9834E−02 −5.3348E−02 −5.3635E−03  3.1933E−02 A6= −3.0832E−03−6.8689E−04  3.3078E−02  2.7876E−02  1.3915E−03 −1.1407E−02 A8=−3.8056E−04 −5.5245E−04 −1.3389E−02 −9.2428E−03 −8.8019E−04  2.3271E−03A10=  9.4417E−04  9.6450E−05  3.4395E−03  1.9058E−03  1.7318E−04−3.3395E−04 A12= −4.7063E−04  3.2080E−05 −5.1114E−04 −2.2204E−04−2.2562E−05  2.9562E−05 A14=  8.8687E−05 −1.6714E−05  4.0067E−05 1.3400E−05  1.7043E−06 −1.4356E−06 A16= −5.1551E−06  2.1223E−06−1.2929E−06 −3.2827E−07 −5.1067E−08  2.9210E−08 Surface # 14 15 16 17 k=−1.0530E−02 −2.0000E+01 −1.7235E+01 −5.9691E+00 A4= −8.8391E−03−2.7957E−04 −3.3694E−02 −1.9362E−02 A6=  7.1645E−05  1.2134E−03 2.7384E−03  2.6056E−03 A8= −2.6111E−04 −6.5498E−04 −2.4460E−05−2.8118E−04 A10=  2.0557E−05  8.8315E−05 −6.6640E−06  2.0114E−05 A12= 4.5655E−07 −5.3096E−06  3.5997E−07 −8.6194E−07 A14= −8.8556E−08 1.5184E−07 −7.3810E−09  1.9839E−08 A16=  2.2376E−09 −1.6863E−09 5.2723E−11 −1.8743E−10

In the 11th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 11th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 21 and Table 22as the following values and satisfy the following conditions:

11th Embodiment f [mm] 6.41 Y11/Y82 0.32 Fno 1.93 Yc82/f 0.36 HFOV[deg.] 44.0 (R15 + R16)/(R15 − R16) 3.64 ΣCT/BL 3.57 R16/f 0.29 Sd/Td0.94 f2/f1 0.56 Td/f 1.12 |f7/f2| 2.05 Td/EPD 2.17 f/f123 0.67 TL/ImgH1.34 |f/f456| 0.29 ImgH/f 1.00

12th Embodiment

FIG. 23 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 24 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 23, the image capturing unit includes thephotographing optical lens system (its reference numeral is omitted) ofthe present disclosure and an image sensor 1297. The photographingoptical lens system includes, in order from an object side to an imageside, a first lens element 1210, an aperture stop 1200, a second lenselement 1220, a third lens element 1230, a fourth lens element 1240, afifth lens element 1250, a sixth lens element 1260, a seventh lenselement 1270, an eighth lens element 1280, an IR-cut filter 1290 and animage surface 1295, wherein the image sensor 1297 is disposed on or nearthe image surface 1295 of the photographing optical lens system, thephotographing optical lens system has a total of eight lens elements(1210-1280). There is an air gap in a paraxial region between every twoof the lens elements that are adjacent to each other.

The first lens element 1210 with positive refractive power has anobject-side surface 1211 being convex in a paraxial region thereof andan image-side surface 1212 being concave in a paraxial region thereof.The first lens element 1210 is made of plastic material and has theobject-side surface 1211 and the image-side surface 1212 being bothaspheric. The image-side surface 1212 of the first lens element 1210 hasat least one inflection point.

The second lens element 1220 with positive refractive power has anobject-side surface 1221 being convex in a paraxial region thereof andan image-side surface 1222 being convex in a paraxial region thereof.The second lens element 1220 is made of plastic material and has theobject-side surface 1221 and the image-side surface 1222 being bothaspheric. The object-side surface 1221 of the second lens element 1220has at least one inflection point.

The third lens element 1230 with negative refractive power has anobject-side surface 1231 being convex in a paraxial region thereof andan image-side surface 1232 being concave in a paraxial region thereof.The third lens element 1230 is made of plastic material and has theobject-side surface 1231 and the image-side surface 1232 being bothaspheric. The object-side surface 1231 of the third lens element 1230has at least one inflection point.

The fourth lens element 1240 with positive refractive power has anobject-side surface 1241 being convex in a paraxial region thereof andan image-side surface 1242 being convex in a paraxial region thereof.The fourth lens element 1240 is made of plastic material and has theobject-side surface 1241 and the image-side surface 1242 being bothaspheric. Both the object-side surface 1241 and the image-side surface1242 of the fourth lens element 1240 have at least one inflection point.

The fifth lens element 1250 with negative refractive power has anobject-side surface 1251 being concave in a paraxial region thereof andan image-side surface 1252 being convex in a paraxial region thereof.The fifth lens element 1250 is made of plastic material and has theobject-side surface 1251 and the image-side surface 1252 being bothaspheric. Both the object-side surface 1251 and the image-side surface1252 of the fifth lens element 1250 have at least one inflection point.

The sixth lens element 1260 with positive refractive power has anobject-side surface 1261 being convex in a paraxial region thereof andan image-side surface 1262 being concave in a paraxial region thereof.The sixth lens element 1260 is made of plastic material and has theobject-side surface 1261 and the image-side surface 1262 being bothaspheric. Both the object-side surface 1261 and the image-side surface1262 of the sixth lens element 1260 have at least one inflection point.

The seventh lens element 1270 with positive refractive power has anobject-side surface 1271 being convex in a paraxial region thereof andan image-side surface 1272 being concave in a paraxial region thereof.The seventh lens element 1270 is made of plastic material and has theobject-side surface 1271 and the image-side surface 1272 being bothaspheric. Both the object-side surface 1271 and the image-side surface1272 of the seventh lens element 1270 have at least one inflectionpoint.

The eighth lens element 1280 with negative refractive power has anobject-side surface 1281 being convex in a paraxial region thereof andan image-side surface 1282 being concave in a paraxial region thereof.The eighth lens element 1280 is made of plastic material and has theobject-side surface 1281 and the image-side surface 1282 being bothaspheric. The object-side surface 1281 of the eighth lens element 1280has at least one inflection point. The image-side surface 1282 of theeighth lens element 1280 has at least one convex shape in an off-axisregion thereof.

The IR-cut filter 1290 is made of glass and located between the eighthlens element 1280 and the image surface 1295, and will not affect thefocal length of the photographing optical lens system.

The detailed optical data of the 12th embodiment are shown in Table 23and the aspheric surface data are shown in Table 24 below.

TABLE 23 12th Embodiment f = 6.35 mm, Fno = 2.00, HFOV = 46.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 4.825 (ASP) 0.561 Plastic 1.550 50.834.90 2 6.179 (ASP) 0.285 3 Ape. Stop Plano −0.049 4 Lens 2 5.715 (ASP)0.752 Plastic 1.544 55.9 8.12 5 −18.510 (ASP) 0.050 6 Lens 3 5.659 (ASP)0.350 Plastic 1.660 20.3 −16.37 7 3.622 (ASP) 0.674 8 Lens 4 19.448(ASP) 0.770 Plastic 1.544 55.9 15.84 9 −15.251 (ASP) 0.103 10 Lens 5−6.047 (ASP) 0.500 Plastic 1.635 22.5 −11.72 11 −33.346 (ASP) 0.289 12Lens 6 5.620 (ASP) 0.777 Plastic 1.544 55.9 13.59 13 22.290 (ASP) 0.09014 Lens 7 3.888 (ASP) 0.624 Plastic 1.567 40.0 20.33 15 5.526 (ASP)0.933 16 Lens 8 3.054 (ASP) 0.750 Plastic 1.544 55.9 −9.95 17 1.783(ASP) 0.700 18 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 19 Plano0.498 20 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 24 Aspheric Coefficients Surface # 1 2 4 5 6 7 k= −4.3241E+00−6.7299E+00  9.4700E−01 −1.0000E+00 −9.4210E+00 −5.2944E+00 A4=−4.4661E−03 −1.4856E−02 −1.7319E−02 −1.0862E−02 −7.6296E−03  6.2673E−04A6= −6.7928E−04 −5.6862E−03 −7.6604E−04 −4.2143E−04 3.4948E−03 2.2152E−03 A8=  2.0353E−05  8.5146E−03  6.8596E−04 −3.7444E−04−1.2514E−03 −9.8051E−04 A10= −9.0099E−06 −5.9052E−03 −4.7613E−04 2.2237E−04 7.4292E−05  1.2074E−04 A12=  2.0738E−05  2.5823E−03 5.3485E−04 −3.5399E−05 2.4241E−05 −3.7754E−07 A14= −2.0689E−06−6.0079E−04 −2.0655E−04 −9.5513E−06 2.5428E−07  1.7342E−06 A16=−3.1019E−08  5.8560E−05  2.7164E−05  2.5663E−06 −7.7954E−07 −5.4395E−07Surface # 8 9 10 11 12 13 k= −1.1423E+01 −1.0000E+00 −3.8457E+01−1.4250E+01 1.3521E+00 −1.0000E+00 A4= −7.3490E−03 −1.7707E−02−4.9946E−02 −3.9601E−02 −9.6610E−03  1.5399E−02 A6=  1.4485E−03 1.1107E−02  3.4639E−02  1.9045E−02 4.7891E−03 −2.9202E−03 A8=−4.3137E−03 −8.7211E−03 −1.5695E−02 −5.8228E−03 −1.7695E−03  2.2557E−04A10=  3.1750E−03  3.1868E−03  4.3692E−03  1.1022E−03 3.1489E−04−2.6354E−05 A12= −1.1899E−03 −6.1955E−04 −6.8187E−04 −1.1549E−04−3.4617E−05  2.4659E−06 A14=  2.1266E−04  5.7846E−05  5.5360E−05 6.1420E−06 2.1157E−06 −9.8966E−08 A16= −1.4022E−05 −1.5544E−06−1.8342E−06 −1.3048E−07 −5.2766E−08  1.1658E−09 Surface # 14 15 16 17 k=−1.3244E−01 −2.0000E+01 −1.2869E+01 −3.7125E+00 A4=  2.0832E−03 1.9559E−02 −2.3271E−02 −2.1912E−02 A6= −3.3972E−03 −4.6770E−03−1.2737E−03  3.0540E−03 A8=  4.0875E−04  2.7721E−04  4.9350E−04−3.4671E−04 A10= −7.5748E−05 −8.0109E−07 −4.0045E−05  2.5018E−05 A10= 9.0199E−06 −3.6823E−07  1.5358E−06 −1.0419E−06 A14= −4.7132E−07 7.7865E−09 −2.9129E−08  2.2854E−08 A16=  8.7344E−09  1.3818E−11 2.1878E−10 −2.0410E−10

In the 12th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 12th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 23 and Table 24as the following values and satisfy the following conditions:

12th Embodiment f [mm] 6.35 Y11/Y82 0.38 Fno 2.00 Yc82/f 0.39 HFOV[deg.] 46.0 (R15 + R16)/(R15 − R16) 3.81 ΣCT/BL 3.39 R16/f 0.28 Sd/Td0.89 f2/f1 0.23 Td/f 1.17 |f7/f2| 2.50 Td/EPD 2.35 f/f123 0.62 TL/ImgH1.40 |f/f456| 0.33 ImgH/f 1.01

The foregoing image capturing unit is able to be installed in, but notlimited to, an electronic device, including smart phones, tabletpersonal computers and wearable devices.

According to the present disclosure, the photographing optical lenssystem has a total of eight lens elements, the second lens element withpositive refractive power is favorable for arranging the lens elementshaving strong refractive power near the middle section of thephotographing optical lens system so as to prevent the lens element withstrong refractive power having excessive curvature, and therebypreventing the molding problems. When specific conditions are satisfied,it is favorable for tightly arranging the lens elements so as to reducethe total track length of the photographing optical lens system.Besides, it is favorable for correcting the aberration and increasingthe relative illumination so as to improve the image resolution at theoff-axis region. In addition, the photographing optical lens systemfavorably satisfies the requirement of compact size and large imagesurface so as to be applied to an electronic device having highresolution. Moreover, it is favorable with the principal point beingpositioned away from the image side of the photographing optical lenssystem for reducing the back focal length, and thereby maintaining acompact size thereof. Furthermore, it is favorable for arranging adiameter of each of the lens elements so as to keep the photographingoptical lens system compact. As a result, the photographing optical lenssystem simultaneously satisfies the requirements of wide field of view,compact size and high image quality.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-24 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. A photographing optical lens system comprising,in order from an object side to an image side: a first lens element; asecond lens element having positive refractive power; a third lenselement; a fourth lens element; a fifth lens element; a sixth lenselement; a seventh lens element; and an eighth lens element having animage-side surface being concave in a paraxial region thereof, whereinthe image-side of the eighth lens element has at least one convex shapein an off-axis region thereof, and both an object-side surface and theimage-side surface of the eighth lens element are aspheric; wherein thephotographing optical lens system has a total of eight lens elements, afocal length of the photographing optical lens system is f, a focallength of the first lens element is f1, a focal length of the secondlens element is f2, a vertical distance between a non-axial criticalpoint on the image-side surface of the eighth lens element and anoptical axis is Yc82, and the following conditions are satisfied:−0.25<f2/f1<1.25; and0.10<Yc82/f<0.80.
 2. The photographing optical lens system of claim 1,wherein the first lens element has an object-side surface being convexin a paraxial region thereof.
 3. The photographing optical lens systemof claim 1, wherein an axial distance between an object-side surface ofthe first lens element and the image-side surface of the eighth lenselement is Td, the focal length of the photographing optical lens systemis f, and the following condition is satisfied:Td/f<1.50.
 4. The photographing optical lens system of claim 1, whereinan axial distance between an object-side surface of the first lenselement and an image surface is TL, a maximum image height of thephotographing optical lens system is ImgH, and the following conditionis satisfied:TL/ImgH<2.0.
 5. The photographing optical lens system of claim 1,wherein the focal length of the photographing optical lens system is f,a composite focal length of the first lens element, the second lenselement and the third lens element is f123, and the following conditionis satisfied:0.30<f/f123<1.5.
 6. The photographing optical lens system of claim 1,wherein a sum of central thicknesses of the lens elements of thephotographing optical lens system is ΣCT, an axial distance between theimage-side surface of the eighth lens element and an image surface isBL, and the following condition is satisfied:2.5<ΣCT/BL<6.0.
 7. The photographing optical lens system of claim 1,wherein a curvature radius of the object-side surface of the eighth lenselement is R15, a curvature radius of the image-side surface of theeighth lens element is R16, and the following condition is satisfied:−0.5<(R15+R16)/(R15−R16).
 8. The photographing optical lens system ofclaim 1, wherein the seventh lens element has an image-side surfacebeing convex in a paraxial region thereof, and the seventh lens elementhas positive refractive power.
 9. The photographing optical lens systemof claim 8, wherein the focal length of the second lens element is f2, afocal length of the seventh lens element is f7, and the followingcondition is satisfied:|f7/f2|<1.0.
 10. The photographing optical lens system of claim 1,wherein a maximum image height of the photographing optical lens systemis ImgH, the focal length of the photographing optical lens system is f,and the following condition is satisfied:0.65<ImgH/f<1.40.
 11. The photographing optical lens system of claim 1,wherein a maximum effective radius of an object-side surface of thefirst lens element is Y11, a maximum effective radius of the image-sidesurface of the eighth lens element is Y82, and the following conditionis satisfied:Y11/Y82<1.0.
 12. The photographing optical lens system of claim 1,wherein the focal length of the photographing optical lens system is f,a composite focal length of the fourth lens element, the fifth lenselement and the sixth lens element is f456, and the following conditionis satisfied:|f/f456|<0.60.
 13. The photographing optical lens system of claim 1,wherein a sum of central thicknesses of the lens elements of thephotographing optical lens system is ΣCT, an axial distance between theimage-side surface of the eighth lens element and an image surface isBL, and the following condition is satisfied:2.0<ΣCT/BL<10.
 14. The photographing optical lens system of claim 1,wherein the seventh lens element has an image-side surface being concavein a paraxial region thereof, at least one of an object-side surface andan image-side surface of the seventh lens element has at least oneinflection point, and both the object-side surface and the image-sidesurface of the seventh lens element are aspheric.
 15. The photographingoptical lens system of claim 14, wherein the focal length of the secondlens element is f2, a focal length of the seventh lens element is f7,and the following condition is satisfied:1.0<|f7/f2|.
 16. The photographing optical lens system of claim 1,wherein an axial distance between an object-side surface of the firstlens element and the image-side surface of the eighth lens element isTd, an entrance pupil diameter of the photographing optical lens systemis EPD, and the following condition is satisfied:Td/EPD<3.0.
 17. The photographing optical lens system of claim 1,further comprising a aperture stop, wherein an axial distance betweenthe aperture stop and the image-side surface of the eighth lens elementis Sd, an axial distance between an object-side surface of the firstlens element and the image-side surface of the eighth lens element isTd, and the following condition is satisfied:0.70<Sd/Td<1.20.
 18. An image capturing unit, comprising: thephotographing optical lens system of claim 1; and an image sensor,wherein the image sensor is disposed on the image side of thephotographing optical lens system.
 19. An electronic device, comprising:the image capturing unit of claim 18.